ccssupra Posted April 20, 2014 Share Posted April 20, 2014 Im wanting a LOUD system for my bpu set up, and I just have a question about the diameter of the piping. If I get 3" 1st and 2nd decats, do these bolt onto the turbos right away? If I got 2.5", how is the piping reduced? I need to get a 1 or 1.2 bar restrictor ring, is this before the 1st decat? Quote Link to comment Share on other sites More sharing options...
listy Posted April 20, 2014 Share Posted April 20, 2014 Im wanting a LOUD system for my bpu set up, and I just have a question about the diameter of the piping. If I get 3" 1st and 2nd decats, do these bolt onto the turbos right away? If I got 2.5", how is the piping reduced? I need to get a 1 or 1.2 bar restrictor ring, is this before the 1st decat? In answer to the first question: The first decat bolts to the downpipe, not the turbos. So long as you get a Supra specific first decat, you'll be fine, regardless of pipe diameter. I can recommend Whifbitz for decats. Be aware, UK spec and J Spec have different size flanges. Second question: Location of the RR isn't of great importance really. Most put it either after the first decat, or before the second. Quote Link to comment Share on other sites More sharing options...
Nic Posted April 20, 2014 Share Posted April 20, 2014 Im wanting a LOUD system for my bpu set up, and I just have a question about the diameter of the piping. If I get 3" 1st and 2nd decats, do these bolt onto the turbos right away? If I got 2.5", how is the piping reduced? I need to get a 1 or 1.2 bar restrictor ring, is this before the 1st decat? 2.5" or 3" they both have the same shape/size flanges so exactly the same fit. The restrictor ring can be fitted between the 2 decat pipes or between the 2nd decat pipe and exhaust, again same size/shape flanges so doesn't really matter. Quote Link to comment Share on other sites More sharing options...
ccssupra Posted April 20, 2014 Author Share Posted April 20, 2014 In answer to the first question: The first decat bolts to the downpipe, not the turbos. So long as you get a Supra specific first decat, you'll be fine, regardless of pipe diameter. I can recommend Whifbitz for decats. Be aware, UK spec and J Spec have different size flanges. Second question: Location of the RR isn't of great importance really. Most put it either after the first decat, or before the second. Brilliant, thanks a lot. So can you confirm that this: http://www.ebay.co.uk/itm/TOYOTA-SUPRA-MK4-JZA80-3-0-3-STAINLESS-STEEL-TURBO-2ND-DECAT-DE-CAT-DOWNPIPE-/350719238624?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3ASupra&hash=item51a87ee1e0 Gets rid of both cats, and the cat back exhaust would be fitted to this, and this is fitted to the turbos? 2.5" or 3" they both have the same shape/size flanges so exactly the same fit. The restrictor ring can be fitted between the 2 decat pipes or between the 2nd decat pipe and exhaust, again same size/shape flanges so doesn't really matter. Cheers, 3" it is then. Quote Link to comment Share on other sites More sharing options...
markylee Posted April 21, 2014 Share Posted April 21, 2014 Brilliant, thanks a lot. So can you confirm that this: http://www.ebay.co.uk/itm/TOYOTA-SUPRA-MK4-JZA80-3-0-3-STAINLESS-STEEL-TURBO-2ND-DECAT-DE-CAT-DOWNPIPE-/350719238624?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3ASupra&hash=item51a87ee1e0 Gets rid of both cats, and the cat back exhaust would be fitted to this, and this is fitted to the turbos? Cheers, 3" it is then. I am pretty sure that ebay link just removes the second decat only. Quote Link to comment Share on other sites More sharing options...
listy Posted April 21, 2014 Share Posted April 21, 2014 I am pretty sure that ebay link just removes the second decat only. That's just a second decat pipe. Personally, as I previously stated, I'd go with someone like Whifbitz, as their parts are great quality. Most of my parts come from them, and I haven't been able to fault them yet. Quote Link to comment Share on other sites More sharing options...
ccssupra Posted April 21, 2014 Author Share Posted April 21, 2014 I am pretty sure that ebay link just removes the second decat only. That's just a second decat pipe. Personally, as I previously stated, I'd go with someone like Whifbitz, as their parts are great quality. Most of my parts come from them, and I haven't been able to fault them yet. Ok, I know visually what the setup looks like now, I would still need the shorter 1st decat. Listy, I already have a whifbitz SMIC on the way from them, because of what I have heard about quality Quote Link to comment Share on other sites More sharing options...
ccssupra Posted April 21, 2014 Author Share Posted April 21, 2014 Also, what happens with the o2/ lamda sensors, does the supra have any? What warning lights should I expect when the full exhaust system included cats have been replaced? Quote Link to comment Share on other sites More sharing options...
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