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Thumbs Up silencer boxes.

Advice needed on this please kind alfisti folk.
I've got a 1.9 jdtm 16v and currentley looking at changing the ugly rear exhaust for a nice stainless steal. Would I benefit anything in changing the center silencer boxes for a straight stainless steal pipe at the same time as the backbox.
So just to clarify it would have a straight s/s pipe from the cat back to the s/s backbox!
Other than more cost to me is it worth doing, improved sound or response????

Cheers fellas
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Re: silencer boxes.

Helo mate

I haven't had a 147 or a diesel, but I would imagine the answer is yes - more power and more noise. get a specialist co to do a custom set (like Torque Exhausts Enfield or Long Life), or you may even be able to buy an off the shelf aftermarket set up as the 147 has been around for a while.
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Re: silencer boxes.

I would think that the answer is no, you will never get a diesel exhaust to be loud , the turbo acts as a very good silencer, and you dont have the revs of a petrol engine,
IMHO i would go for something that tidies up the back end of the car and looks nice, trying to increase noise, performance by fitting a sports centre section is not best use of your funds.

get a cosmetic back box and spend the rest of the money on a remap

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Re: silencer boxes.

Agree with above, i did the same to my old Leon TDI cupra. Backbox (for looks) and a remap (for performance) are the best ways to go. Centre section will do bugger all without replacing the cat.

I preferred my turbo whistle after the remap, helped to drown out the tractor noise!! plus 50hp extra does give you a smile.
 
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Re: silencer boxes.

Sorry, but those last 2 posts are nonsense. You get all the same benefits of fitting a bigger and/or freer flowing exhaust on a diesel as you do on a petrol. There are several systems available for your car. Go ahead and fit a complete new system if you can, it will make a world of difference, especially if combined with an induction system and a remap. If you fit a larger intercooler you ll improve things even more. Several people on here have done all 4 mods and got up to 230 bhp and 360+ ibs/ft of torque.
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Re: silencer boxes.

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Originally Posted by typos1 View Post
Sorry, but those last 2 posts are nonsense. You get all the same benefits of fitting a bigger and/or freer flowing exhaust on a diesel as you do on a petrol. There are several systems available for your car. Go ahead and fit a complete new system if you can, it will make a world of difference, especially if combined with an induction system and a remap. If you fit a larger intercooler you ll improve things even more. Several people on here have done all 4 mods and got up to 230 bhp and 360+ ibs/ft of torque.
i think you are very rude, do you have any manners?

you mean you do not agree with the last 2 posts.

manners cost nothing.
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Re: silencer boxes.

still reckon the best bhp per pound route is the cosmetic box and remap, cant say i have ever heard a really rip snortng diesel exhaust though i may stand corrected
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Re: silencer boxes.

Thanks for the replies chaps!

Just to clear things up, I dont want to install a center section just to increase the noise from the exhaust and make it loud. I know that it will never sound anything like that of the petrol version if like wise was done.

I agree that the rear needs a tidy up with a new s/s box that doesnt hang down so loo, but while I was fitting it I just thought it might be worth changing the centre section aswell. Like the replies above I have been told yes it would make improvements or no it wont make a difference. The debate goes on it seems!!!

The car has already been re-mapped, and I have asked about a BMC CDA but have been told (again) that my particular engine wont recieve any great benefits from such a induction system.! Any thoughts on this??

Once again, cheers fellas!!!
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Re: silencer boxes.

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Originally Posted by JonoQ2 View Post

The car has already been re-mapped, and I have asked about a BMC CDA but have been told (again) that my particular engine wont recieve any great benefits from such a induction system.! Any thoughts on this??

Once again, cheers fellas!!!
I had an induction kit (again on the Leon, so not an Alfa engine) and it made it sound like a dog. Just way too noisy, i'll even go as far as to say it amplified the diesel clatter. Eventually opted to use a performance panel filter.

I don't really think it made a HUGE difference, but when something make a nice noise it always seems faster.....
 
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Re: silencer boxes.

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i think you are very rude, do you have any manners?

you mean you do not agree with the last 2 posts.

manners cost nothing.
Lol, you think thats rude?

I did qualify it with "sorry", but what was said in the 2 posts isnt true

What applies to a petrol exhaust also applies to a diesel exhaust, be it noise or power/torque gains. There is NO debate, it is fact.
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Re: silencer boxes.

A turbo tends to chop up the exhaust pulses, which ruins the sound somewhat.

I don't think any exhaust will make a 4 cylinder diesel sound nice TBH.

It will look a lot better with a stainless box though.
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Re: silencer boxes.

A Supersprint rear silencer, centre pipe and down pipe to remove the pre-cat along with a BMC panel filter? Just to throw that into the mixing bowl lol
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Re: silencer boxes.

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Originally Posted by Supersprintuk View Post
A Supersprint rear silencer, centre pipe and down pipe to remove the pre-cat along with a BMC panel filter? Just to throw that into the mixing bowl lol
any ideas where he could buy that nice little lot from?
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Re: silencer boxes.

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Lol, you think thats rude?

I did qualify it with "sorry", but what was said in the 2 posts isnt true

What applies to a petrol exhaust also applies to a diesel exhaust, be it noise or power/torque gains. There is NO debate, it is fact.
yes saying members are talking nonsense is rude, you wwaannkeerr

yes i can go Lol too now.
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Re: silencer boxes.

behave kids.
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Re: silencer boxes.

What have I started, shall I get a referee. . . .???
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Re: silencer boxes.

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yes saying members are talking nonsense is rude, you wwaannkeerr

yes i can go Lol too now.
Ok, but what do I do if it isnt true, just let it go? If every one did that the site would be useless.

PS like the way you get round the site's anti swear software!
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Re: silencer boxes.

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Originally Posted by rodz1300 View Post
any ideas where he could buy that nice little lot from?
The clue is in the poster's profile name-you can get em from super sprint!
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Re: silencer boxes.

https://www.alfaowner.com/Forum/poll-...-*****ier.html



I've looked at changing the cat and centre section on the GT (same engine). Secure UK tuning store Alfa, Ferrari, Fiat, Lamborghini, Lancia, Maserati

From what I gather you should see less lag with a bit more power/torque, a slight noise increase so maybe you might hear the exhaust??

I'd like to do the whole works, FMIC, de-cat, airfilter and re-map but everytime I go to press the checkout button I bottle it I'm strating to think that my money would be best spent on lowering springs and a re-map, at least untill work becomes more secure.

I shall be interested in the outcome if you go ahead with the plans though
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Re: silencer boxes.

Spot on.

I ve changed the exhaust on a diesel before and there was definately a small performace increase and the noise was nicer and barely any louder.
Course if you dont like the sound of a diesel engine then buy a petrol!
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Re: silencer boxes.

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Originally Posted by JonoQ2 View Post
I have asked about a BMC CDA but have been told (again) that my particular engine wont recieve any great benefits from such a induction system.!
What were you told exactly??

Looking at the intake on the jtdm it seems like a poor setup?? Narrow tubing with resonators etc. I assume that if this was replaced with a less restrictive intake you'd see an improvement??

Having said that, how much air can the turbo force in?? There wouldn't be much point in a less restricted intake if the turbo can't get any more air in would there?? It could spool up quicker but not give any better peak performance. Also, to much air could cause overboost??

Cheers.
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Re: silencer boxes.

Should spool up faster with a less restricitve intake, same boost using less exhaust gasses over the vanes, this means the exhaust gasses will be flowing better out of the engine, rather than the engine having to push the gasses out. Bit more power there. Yes, if you have had the car remapped with a restrictive intake then by fitting a less-restrictive intake it will overboost. But a standard car won't overboost by fitting a CDA unless something is borderline not-working anyway.

I think if anyone wants a beast of a JTD, you can't just get a remap. It has to be the works, re-done intake, and just as importantly a re-done exhaust. Bigger bore exhaust from the turbo back, incorporating a decat section and no silencers. Shortened, smoother intake with FMIC. Plus water/meths injection for the real hardcore out there

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Re: silencer boxes.

Exactly, the thing is a lot of people , incorrectly, assume that those sort of mods dont appy to a diesel and that theyll make no difference. I ve been told this by garages about air filters and exhausts.

It stems from anti diesel predudice that started because, up until common rail was introduced 13 years ago nobody really bothered developing the diesel engine, so they were low powered, slow and noisy.
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Re: silencer boxes.

I agree with Pud237.

In my case (1.9 JTD 8v) the downpipe, cats and backbox were replaced for a freeflowing stainless system (custom build). The diameter of the downpipe is increased and the small cat that is directly behind the turbine is cut off and a cone is welded on to get the transistion to the downpipe. The center cat is replaced by a freeflowing silencer and the backbox was removed completely.

The result: more power through all the range. Especially from 3000 rpm to 4500 rpm loads of extra power. If I have to guess I'd say it's 10 BHP extra in the high range. In practice that means 1000 rpm
more powerband and better pickup from low revs.

In my opinion, anyone who's saying an exhaust doesn't make any difference on a diesel has no experience with it or didn't do the job right.

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Re: silencer boxes.

What does it sound like now??
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