ugh. Exhaust. The most commonly screwed up thing. EVER. Its almost an art, and it IS a science. Ever take 2 liter bottles and but water in them and something to keep it from spilling out, take caps off. Then let the water slowly drain as it bubbles, *BUT - SPIN the bottles around, it creates a vortex/whirlpool that makes the water drain out MUCH faster. This is why bigger is NOT always better. They tune the size to produce a suimilar effect. Best thing IMO is get tid of most restrictive thing (resonator), replace with a borla pro XS (extra silent) muffler for the resonator and get rid of your mufflers. Awesome.