they're based in Scotland ? I need something more south
Guy you want to speak to is Craig
When is 2.5" too small?
- Thread starter RobDon
- Start date
Guy you want to speak to is Craig
I went up and spoke to Stainless Creations at lunchtime today, they can make me a full 3" system for around £450 with one large rear silencer or £500 for one with a middle silencer too - lifetime warranty too. The guy did say that over 300bhp you should be looking at a 3" system.
So can anyone tell me if it really is worth going from a 2.5" system up to a 3"? Is 2.5" restrictive for a GT28RS turbo?
I'd say yes, it's restrictive. I think you should be looking at 2.75" to about 400bhp, 3" after that.
I think so too, problem with the Milltek system is that it is very expensive for a 70mm system (£528 inc.VAT) and I'd still have to use a step-down adapter to mate it to the 63mm pipe behind the CAT, so a very small section of the exhaust would still be 63mm.
The custom system would be a full 3" right from the turbo to the tail, with two silencers, and still cost less than the smaller Milltek which only has one silencer and smaller pipework.
The custom system would be a full 3" right from the turbo to the tail, with two silencers, and still cost less than the smaller Milltek which only has one silencer and smaller pipework.
I think for any BT you should be running 2.5".
I got gains on my k03s going from 2.5 to 3".
Get it done Rob.
I got gains on my k03s going from 2.5 to 3".
Get it done Rob.
This is exactly the principle behind fish-tail exhausts of 1940s Harleys, Indians and 750cc BMWs
They do flow enough to avoid restriction on engine power, but taper to avoid breaking the biker's eardrums.A cheaper alternative may be a valve opening the exhaust straight to air and they are legal at MOT time, very noisey and I should imagine illegal to use, but they have to catch you with it open maybe
Just for the record, I've broken my exhaust muffler due to hitting a kerb. The pipe had broken over the rear axle, maybe 3 inch before the muffler, which had fallen down on the tarmac (held only by the rubber hanger). I've run the car for 2 days with no muffler at all before welding it back at a workshop. Up to 4000-4500 rpm, the difference in noise between muffled and unmuffled exhaust was hardly audible. I've expected a Superbike-like roar and got just a slightly louder drone and boom.
Exhaust was stock, with stock catalyst, stock resonator, and a fabricated 3" downpipe.
The muffler could have just been replaced with a straight pipe and there would have been only a slight difference.
~Nautilus
PS Hardened also the two rubber hangers to raise the muffler 2-3 cm upwards. The front hanger got doubled by slipping a rubber-ring (from a Renault muffler hanger) over it, the rear Y-shaped hanger got bandaged with many plastic zip-ties over the arms of the "Y". Before, a hand push bounced the muffler up and down a few centimeters. Now they hardly move, regardless how strong is the push.
I now have a full 3" exhaust system with two silencers, a small centre one and a larger rear - not tweaked, flattened or reduced anywhere ... definately an improvement over the 2.5" system right through the rev range, coming on boost, part throttle, top end are all improved.
Definately quieter on idle and when cruising, but louder when giving it some. I have added some Dynamat sound-proofing under the rear seats so it's fine for all but full bore driving.
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