With I/H/HFC/E, forged internals, valvetrain, and cam upgrades my greddy evo only rang in a 91.5dB without baffle. That's plenty legal in California and I got my nifty sticker from the testing station. The judge was surprised because the EVO isn't designed for a baffle (no silencer) but had to refund my money. I'd say EVO all the way!