Originally Posted by SS_Firehawk

It will be loud, it will take a higher pitch. With a fast intentions exhaust, I'd recommend resonators. They make good power. I had them on my last Z. I'm trying the Z1 headers this time around. There are options if you want cats. Motordyne has a y pipe with a hfc's option. Their e370 exhaust has a cat option if you contact them. Fast Intentions also has the option for 100 cell cats as well.