nicky Posted August 10, 2017 Share Posted August 10, 2017 Was getting my box shimmed by David and he mentioned the limitations of the autobox and it's all in the torque figures... He also mentioned I can get higher HP nunbers out of the old girl but sacrifice torque which I'm OK with doing so he said the exhaust diameter can help with that, in currently on a 3" HKS super silent which if I upgrade to 3 1/2-4" what sort of figures can I see improved? Currently my setup can handle 700hp apart from the box (currently 525/550) also going to be getting a new fresh map to suit the car What I'm asking is am I correct in thinking all of this, what sort of power gains in HP can I see, and what 3 1/2"/4" systems would be recommended to me? Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 10, 2017 Share Posted August 10, 2017 I found this gem for information on exhaust size , bigger is always better when you have a turbo , http://www.mkivsupra.net/vbb/showthread.php?278633-3-quot-vs-3-5-quot-exhaust-confirmed-results Quote Link to comment Share on other sites More sharing options...
nicky Posted August 10, 2017 Author Share Posted August 10, 2017 Had a read through that, a lot of good information, any idea what 3.5" systems are best to go for over here in the uk? Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted August 10, 2017 Share Posted August 10, 2017 (edited) Aftermarket you have the choice of Amuse, Veilside and a GReddy I think, trying to find any of these will be difficult. There is only one 3.5" exhaust on the UK market, TB Developments exhaust based on the Amuse R1 and it looks a nice bit of kit. E2A 1st & 2nd 3.5' decat pipes with flex joint à la OEM here - http://www.mkivsupra.net/vbb/showthread.php?338434-TB-Developments-TT-Decat-Pipes 3.5" exhaust here - http://www.mkivsupra.net/vbb/showthread.php?331224-Tempted-to-make-my-own-range-of-exhausts or contact GReddy US about their new exhaust here - http://www.mkivsupra.net/vbb/showthread.php?343956-NEW-GReddy-Exhaust-Prototyping Edited August 10, 2017 by Frank Bullitt Links added. (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 10, 2017 Share Posted August 10, 2017 Yeah they are not in massive production , and crazy money for a bit of ss pipe and you still have to adjust the down pipe to match your turbine, whifbitz do one think it was £600. Me being me bought all the stuff and made my own 3.5 down and mid pipe , cost about £300 and now have a welder Quote Link to comment Share on other sites More sharing options...
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