david nelson Posted November 29, 2003 Share Posted November 29, 2003 Is it posible to convert my 4-1 compotition exhaust in to a 4-2-1? Link to comment Share on other sites More sharing options...
Rob Walker Posted November 30, 2003 Share Posted November 30, 2003 Yup, buy the 421 collector pipe and cut the primaties to the length you want. You will also have to move the mounting tabs on the primaries to match the collector. I would advise you to sell your system unmolested and buy the system you want there is a very good market for the 4-1 systems it won`t cost you too much to swop and save yourself grief. Link to comment Share on other sites More sharing options...
Rob Walker Posted November 30, 2003 Share Posted November 30, 2003 The hole in the side skin is also the same for the VHPD 421 system. Link to comment Share on other sites More sharing options...
Michael_E Posted November 30, 2003 Share Posted November 30, 2003 You might want to hang on to the 4-1 if your going without CAT as the MOT test will require it (depends on year of car, but if its recent then I'd hold on to it). You could do what I did, which was to go 4-cat-1 and then get the bit to replace the CAT. Its a bit of and expensive way round but you can keep your CAT stored away for that rainy day and it becomes a quick job to swap between the two. WOW I've made the lofty hights of WINDBAG 😬 Edited by - Michael_E on 30 Nov 2003 10:09:45 Link to comment Share on other sites More sharing options...
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