Just wondering what peoples experiences are with either hi flow cats or to go with test pipes?

 

I like test pipes but they're stinky as hell. Enough to give me a head ache sometimes. They sound good too as long as their resonated..u'll get that gurgley sound that makes me warm inside. I have no expierience w/ HFC

 

Test pipes give better flow & gains, but if carb, emissions, & smog is what you're worried about down the line then HFC. I also don't like the fact that test pipes make most of the exhausts out there raspy. Nothing more grating to me than hearing the engine accelerate then hearing a buncha backfiring pops when its decelerating.