Ive done quite a bit of research on test pipes but I'm still not sure what will be best paired with the invidia Gemini system. I really like the CNT resonated test pipes but they don't fit an automatic :/ I don't want hi flow cats because if I'm gonna go with test pipes I mine as well go all the way. On the other hand I don't want a non resonated because of rasp, so I'm looking for a resonated test pipe. Is anyone happy with a certain test pipe that is running the invidia Gemini cat back exhaust. Also I'm running stillen gen 3 intakes. Thanks, hope to get a better idea of what to get before I buy something I'm not satisfied with.

 

Been happy w/ my OBX RTPs, no CEL code thrown and no rasp when I had it paired w/ my OEM Y pipe and Y-back TopSpeed exhaust. It has some rasp now w/ a new Y-pipe, but this isn't due to the RTPs, there's a mismatch in the y-pipe to mid pipe mate.
Here's a thread I posted on them
https://www.myg37.com/forums/engine-...est-pipes.html

 

Thanks man, great review too. I read your thread the other day and was interested. the only thing I didn't like about those test pipes was the extra O2 sensor. You said the bolt eventually wiggled it's way out? Any issues with it again or was that the wrong thread pattern? I found that beluga, top speed, Megan racing and IRS racing all have about the same RTP's and around the same price. Also they seem to all need better gaskets, so I'm expecting to buy the Z1 metal gaskets for whichever route I go. Are those going to be similar to the OBX

 

That was another member that got the wrong bolt/plugs(s), mine are still tight as day 1, and the plugs only cost a couple bucks. And the OBX AFAIK, are the only ones besides the Fast Intentions, that use that long curved O2 port, which is still CEL free after 8k miles.
If you use high temp RTV on the cheaper gaskets you should be ok, but can't go wrong w/ those Z1s, there might be other similar aftermarket gaskets, didn't check around to see.

 

Ok gotcha, I picked up the plugs yesterday and ordered the test pipes as well!! I'm gonna get the berk gaskets which are 9 dollars each which isn't to bad. Did you need a gasket for the plug as well?

 

No, just a coating of that High temp red RTV sealant. Also be sure to get that copper based anti seize to put on all your new fasteners, will make any future work much, much easier.
And if you've never removed cats before be sure to read this thread, that ATF-Acetone mix is the key!
https://www.myg37.com/forums/g37-sed...y-be-atch.html