Quote Originally Posted by rrutter81
Ours deepens with larger piping however going beyond a 2.5 is counter productive to our FI engines. I think we lose 14 hp if we go from 2.5-3.0. Resonators/mufflers make a huge difference.

I found a whisper resonator from ZZPerformance and may go with that. Sounded very stockish. Unfortunately its a pricey one. Especially after spending a few grand on this exhaust.

May help hondas i dont know. It is annoying after 3k rpm and makes me feel like a high-schooler again. Thanks guys for the input/help on this.
Lose HP with larger muffler? Negative. You will gain HP and quicker rpms. You will lose some tq if you open the exhaust all the way. The more mufflers, converters, etc... the more tq (to an extent).

-Ant.