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(Post Link) post #1 of 5 Old 08-12-03 Thread Starter
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Just jumping in here but whilst on the subject of exhausts I'm not too happy with my Powerflow set-up. I wasn't given the choice of bore size and told that it would only be 'slightly' louder than normal. Up shot is it sounds like I'm sitting in a Challenger tank and at 60-80mph the sound inside is too loud (I had a cat back replacement with the 'triangular bit' removed - 98 Cloverleaf). I do a lot of motorway driving so it's starting to get on my nerves. Does anyone know of any ways to quieten it down without a major refit?

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Not really sure. Maybe you could get a small silencer fitted where the triangular one was? You'd only really fit a pretty small standard shaped silencer there though.
It seems that the service can vary from powerflow fitter to fitter. Might be worth contacting powerflow h.q. and asking them if they'll meet you halfway with costs for a modification, since you weren't offered what their website says you should have been in the first place.
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(Post Link) post #3 of 5 Old 08-12-03 Thread Starter
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Cheers Bazza, hadn't though of getting in touch with Powerflow direct. I'll also probably get in touch with a few Alfa specialists and see what advice they have to offer re: smaller silencers.
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Hey Danny P, how long has it been since you had the new exhaust? When I had my system done (cat back, but longlife rather than powerflow) I wasn't too happy to start with. It sounded like a Harley at idle, and was pretty wearing on the motorway (although it popped on the overrun quite nicely). Then, not sure if I just got used to it, but I'm pretty convinced it's got a lot quieter; I've even thought that it's a little too quiet....)

Not sure if that helps, I guess if you want to get Powerflow to help you out you'll need to complain sooner rather than earlier...
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I have a Powerflow on my 155. It was noisier when I first got it but has quietened down. I too do a lot of motorway driving, but there is very little noise unless you accelerate. At idle I have a low rumble which transforms to the nice "Alfa" rasp at higher revs.
With regards to bore size, mine was fitted with the same bore as the original exhaust. I also removed the corner box to give only 2 silencers instead of 3. They also built me a stainless decat using a small box (free of charge !!!) as when they tested the car, it was a lot louder than normal with the straight through decat pipe I had on.
Going back to bore size, you are best to keep as close to the original unless you are running a turbo, it's all to do with "pulse tuning". A wider bore lets the gas pulse cool down, therefore becomes heavier, doesn't move as fast and doesn't create as much vacuum behind it to "pull" out the next pulse. Make sense ????
As someone said earlier, the standard of Powerflow centres seems to vary. The garage I used prepare cars for track/race use and do a lot of work with Scoobys, Evos and other very tuneable cars.

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