kubus1 Posted January 4, 2003 Share Posted January 4, 2003 Happy New Year All, I have asked you guys once about the custom made exhasut. Somone mentioned that it should be a 3" or nothing. I can get a 2.5" from Powerflow but not 3". What real difference does it make and would you fit a 2.5" system? Thanks Cuba Quote Link to comment Share on other sites More sharing options...
Alex Posted January 4, 2003 Share Posted January 4, 2003 Are you talking about from the cat back or from the turbo's back? Most aftermarket cat back zaust's are 3"+ in diameter. The decat pipes on a Euro/UK spec can be 3" in diameter. The decat pipes on J-spec really have to be limited to 2.5" You need to decide what your ultimate goals are for the car. IMO a 2.5" system will not be good enough. A pair of decat pipes and an Apex'i, Blitz, HKS cat back is common, cause it works! Quote Link to comment Share on other sites More sharing options...
GavinL Posted January 4, 2003 Share Posted January 4, 2003 What's the problem with buying a 3" exhaust again? For what it is worth I wouldn't put a 2.5" exhaust on a MKIV, may as well stick with the stock one if you are going to do that. Quote Link to comment Share on other sites More sharing options...
kubus1 Posted January 4, 2003 Author Share Posted January 4, 2003 Thanks Alex, I was thinking about the full decat system. I got a good quote from Powerflow for the whole lot but its only a 2.5". Do you know whats the stock exhaust size, just to compare? IMO, I didnt think that the .5" would make such a great difference. I think I ll go with that. Thanks Quote Link to comment Share on other sites More sharing options...
Druid Posted January 4, 2003 Share Posted January 4, 2003 The .5" will make a significant difference when it comes to how freely your exhaust will flow. With turbocharged engines, bigger is better (argueably), you want your exhaust to give you as free a flow of gasses as possible. 3" is the common diameter for the Suup IIRC. Quote Link to comment Share on other sites More sharing options...
GavinL Posted January 4, 2003 Share Posted January 4, 2003 Leon does a 3" full stainless cat back exhaust for about £350 and decat pipe for about £200. The 3" tip is not everybodys preference but if money is an issue I would rather have performance over looks any day of the week. Quote Link to comment Share on other sites More sharing options...
Alex Posted January 4, 2003 Share Posted January 4, 2003 Mongoose do a 3" system from the Turbo back....but its a bit tame in the noise dept. Quote Link to comment Share on other sites More sharing options...
kubus1 Posted January 4, 2003 Author Share Posted January 4, 2003 I have just spoken to Powerflow again today and they have verified that they can do a 3 " exhaust and in their opinion I should not put anything smaller on a TT. I had a quote from them but for a 2.5" so I have to go there again and negotiate my new price. Thank you all for the best advise. Thanks Gavin for recomending Leon, if Powerflow should not work out I will get in touch with him. Have a good weekend Cuba Quote Link to comment Share on other sites More sharing options...
Steve W Posted January 4, 2003 Share Posted January 4, 2003 Mongoose do a 3" system from the Turbo back....but its a bit tame in the noise dept. ALL RIGHT...ALL RIGHT.....I know I've only got a feeble squeek ! You Big Boyz....sorry, Big BORES are all the same ! Psychologically, I keep FEELING my Mongoose MIGHT be still holding mine back a bit....that's probably just because of the 'quiet-ness' ?? [ It HAS done 165 with it on, so no 'high-speed' restriction (but, perhaps you need a free-er pipe for hard acceleration ? ?) ] I'd STILL like a little more noise though, Mongoose = sensible. BUT, BIGGER = BETTER [bTW the exit from my Jap turbos is SMALLER than the exhaust 'pipe itself ! The cat' replace' pipe 'necks-down' slightly to match the outlet of the turbo ! ~ 2.75" ? so...................? ? ? ?] FatS. Quote Link to comment Share on other sites More sharing options...
Matt C Posted January 6, 2003 Share Posted January 6, 2003 I thought about the Mongoose to as it works out quite a lot cheaper to have one of those rather than buying a cat back system and then having the cats replaced too. Having spoken to somebody about it though I decided against it on there opinion. £500 saving on the Mongoose though.....fair few quid. The mongoose on my old Cossie was quiet to start with....but after 6 months of (ab) use it got louder. Quote Link to comment Share on other sites More sharing options...
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