anyone have any experience with these? rasp?

Z1 370Z / G37 High Flow Metallic Catalytic Converters

 

I have a 2009 G37 Coupe S, and just had Z1 Motorsports install a Stillen Catback exhaust with the Z1 High Flow Cats. I already had the Stillen Gen 3 intakes installed previously. My goal was to gain some power but NOT have a loud exhaust. I have not noticed any "rasp" with my set-up. The HFC's certainly make the system louder but nothing outrageous, and certainly not as loud as test pipes.

 

noticable gain? how are these compared to like a berks etc... seems like a great price for them!

 

Honestly, if you're going to go through the headache just get resonated test pipes

 

in Chi, so gotta have cats..

anyone comment on these? seem priced very well! surprised they arent more popular! like over a hundred cheaper than berks...

 

I'm also curious to hear what people think of these. Who has these?

 

Are they resonated? maybe that's why they are cheaper.

 

Z1 are not resonated. Berk isn't resonated either and they are $500 vs. Z1 at $375. I had a Z1 products on my Z32 and was happy. I'm not sure why more people aren't sing the Z1 HFC. I want to figure this out before I buy them.