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Might soon be in the market for a new exhaust but only need the rear box. Would like something with a bit more Vroom, what has anyone else done. Throw me some ideas and prices. Cheers.
 

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Bear in mind that the OEM system is one piece from the cat back so the backbox isn't replaceable on it's own unless you start getting handy with an angle grinder and welder.

The cheapest you'll get a full stainless cat back system for is about £260 (MIJ in Wallsall). A full standard cat back steel system with chrome oval trim tailpipe can be get for about £130 (Euro Car Parts). Then there's the budget option of a full cat back steel system with a rudimentary steel round tailpipe (no chrome trim) which you can get for around £60 delivered off eBay.
 

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Thanks for the info. I'm also very much interested in this and thought rear silencer (backbox) is independent from the rest. Interesting. Would love to hear the MIJ system - Alfa Romeo Stainless Steel Exhaust Custom Built MIJ Performance Torque Flow System :: UK.

And how much was the Alfatune if I may ask? Is anyone doing a decat on this cars? Is it worth changing a mid silencer as well?

I've found some CSC and Ragazzon here - Alfa Romeo Shop - Tuning, Styling, Fanartikel und Modellautos - Alfa Romeo 145 Tuning & Styling / Alfa 146 Romeo Tuning & Styling .
 

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If you look under the back of car you will see that on an the OEM system where the backbox connects to the centre silencer (large triangular shaped box) there is no bolted or sleeved join to enable you to unbolt and remove just the backbox. The whole system right back to the catalytic converter has been fabricated as one complete piece.

The Ragazzon kit is nice but very expensive. If you have the option of getting a custom stainless system built to your car then it is usually a much cheaper to get done and will be just as good as a Ragazzon if using an experienced exhaust system fabricator.

The CSC systems aren't full stainless (they're just steel with a hard textured black chip resistant coating on) and even though they are showing as being available for purchase, there was some doubt a few years back as to whether or not CSC were still actually making these for the 145/146 so it would be best to check direct with CSC first.

Some people have de-catted their cars but it's a real pain in the UK because the annual MOT won't pass without a cat fitted (will fail on the emissions test). This means that if UK owners do a de-cat they have to put it back in again every year for the MOT which is a hassle. And doing that doesn't address the problem of potentially being stopped, checked and fined by VOSA roadside patrols between MOTs. I'm not sure what testing or how strict they are with car emissions in Slovakia so those issues may not apply to you.
 

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Thanks for further explanation GialloEvo. As I said I did not look carefully before. You're right of course and one can clearly see it here:
http://www.alfaworkshop.co.uk/images/60615376-164-1-800.jpg
http://www.alfaworkshop.co.uk/images/60620108-166-1-800.jpg.

And you're also right about heaving it build by independent specialist is usually cheaper. That's why I'm so much interested in MIJ and AlfaTune. Prices are all right. However my question is what benefits I'll get of buying the whole cat back instead of muffler only (assuming I'm handy enough to fit it:)).

Regarding decat it was only an idea. I even don't know how many cats 145 QV has. There are 2*2 cats on my GTA and getting rid of front ones still allow to pass MOT when properly heated. Anyway you might still "buy" your MOT in here and have not seen mobile testing facilities so far.
 

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There is only one CAT fitted on a 145/146 and MOT tests in the UK are getting even more strict this year. Previously you could still pass an MOT without a CAT fitted as long as the emissions were still within the required limits (pretty difficult to do though on a 145/146, if not impossible). However, this year the new requirements state that a CAT has to be physically present on the car for it to pass an MOT (or pass a VOSA roadside check) so it's now even more of a deterrant at trying to stop people de-catting thair cars.
 

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Wondering how many cars this will affect. How many enthusiasts are out there de-catting. Pretty confident not a number to mention to measure any effect of their behavior towards nature.
 
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