Working towards an Edge Juice w/ Attitude for my truck. Mainly for the gauges and protection, not racing. I've had the stock muffler removed, not the resonator. Do I need a larger diameter exhaust before I put on the chip? I know a 4" would flow better, but my turbo outlet is still stock. What say y'all?

 

you can get 4" systems cheap. they will help some with EGT's and IMO they sound better. your not going to get any radical HP out of them.. and you dont need to for the EDGE. but like all things more air in, more air out.

 

I agree. Larger diameter exhaust is more for lowering EGT's than anything else. If you're after HP gains then you wont find it there. 4" is generally the all around size for any truck, unless you're creating lots of HP but the straight piped 3" wont cause a problem unless you cant keep your EGT's down.