I went to install my exhaust today, and ran into some crazy problems lol. I put in the BPM downpipe, then tried putting in an HKS carbon fiber cat back kit. Well, the downpipe and cat back exhaust did not fit. there was a 6 inch difference between the mid pipe and downpipe. anyone run into this problem? I sent back the BPM downpipe, and ordered the HKS downpipe. I am guessing the BPM is designed to be used with their own exhaust system. I wasn't very happy today lol.

Also I am putting in the O2 eliminator kit, has anyone put this one in yet? the wiring digram in the instructions suck and make no sense. any help would be appreciated.

 

hahaha, u need to do more reserch b4 u do ur mods
the U.S. spec wrx has 3 cats, and the jdm sti only has 2. so the size of the down pipe and middle pipe of the U.S. verson is different from the ddm ones, so u kindda have to get the jdm front, middle and rear pipe, and that would get rid of the extra cat. but ofcourse this would not allow u to pass somg, so u better skeep ur stock pipe

 

I had the BPM Downpipe, but apparently that is only to be used with their exhaust system. I used the whole HKS turbo back system, and it fit perfectly, and sounds great. also I feel a huge difference in performance.

 

hey i have my own prob, i just got a zero sports down pipe, the stock jdm sti middle pipe, and sti genome rear pipe. would everything fit well? or the fittings would be different from the stock ones? did u go to a muffler shop to do urs?

 

No I do all my own work. I don't know if those pieces fit. I used the HKS down pipe and the HKS exhaust, it fit perfectly and sounds great and I noticed a huge difference in performance.