Yeah, if you're going to swap out for anything other than OEM cats, just get the resonated test pipes. The performance gains are very similar between the HFC's and RTP's but the price of test pipes are a fraction of HFC's. Plus, getting test pipes back off are far easier than cats over and over.

 

If you want a tune go see Seb at Specialty Z in Chatsworth you won't be disappointed!

 

Saul Nismo knights he does a very good job on tuning.

 

Thank you fellas, defiantly appreciate all the input. I'll post some pics when parts come in.

 

If you are doing the install here's a thread that should help & be sure to use the 50-50 Acetone/ATF mix to help w/ breaking the bolts free~
https://www.myg37.com/forums/g37-sed...y-be-atch.html

 

I second this.

I wouldn't even attempt to remove factory OEM cats without first soaking the bolts for at least a couple hours in the 50/50 mix.

PB Blaster etc. is garbage compared to the 50/50 mix.

Thanks again blnewt for this pro-tip.