ISR Performance?
 

Who knows what about them?

Formerly ISIS performance, it seems like they're mostly popular among the S-chassis crowd. I'm hearing things about them possibly being a re-brand/revamp of Enjuku Racing but I have no idea how much truth is behind that. Either way their pricing is on par with CNT/Megan so I'm curious if they suffer the same quality woes or if anyone has any experience with them. Their resonated test pipes can be found for $160.

Who has or knows someone that's had experience with the brand?

:eek::eek:

Remember you get what you pay for.. and it costs less to do things right the first time.

Never heard of them but a forum sponsor sells them, buy from them:

https://conceptzperformance.com/isr-...34_p_27045.php

A couple other options in the same price range:

https://conceptzperformance.com/mega...z34_p_7318.php

https://conceptzperformance.com/top-...es_p_13148.php

I figured I would chime in on this as I actually ran their resonated test pipes on my G37 for a little bit as part of their test program. They fit up just fine, pulled my OEM cats off and popped those right on without issue.

With my stock G exhaust it was slightly louder at idle and cruising, but when you got in to throttle it definitely woke up and actually sounded pretty cool. At low RPM/high load situations it would have a bit of a rasp at around 2300rpm iirc, but it wasnt terrible, and I would assume most other test pipes or resonated test pipes would have similar qualities.

Material quality/weld quality was decent, nothing incredible, but a good value for the money from what I could see and there were no glaring issues.

I ran the Y pipe as well and that fit up just fine, quality was good on that also, it had some nice reinforced flex sections on each runner and then a nice reinforcement plate on the bottom with a little bend up at the front, I would assume to stop it from catching on stuff on lowered cars which I thought was pretty cool.