Got an interesting situation with the R: <p>Within the last couple weeks, when I nail the gas and accelerate hard it sounds like my car has some crazy cold air intake or something! It's a rush of air that seems to either get sucked in or is being forced out somehow. The harder you gas it the louder the sssssssssssssssssssssss sound, though under mild or moderate acceleration it's not noticeable.<p>Recent mods include the Phuz DP (2 months ago), IPD Boost Gauge (1 month ago) engine blankie removed (1 month ago) though this problem was not noticeable after any of these mods, only just recently.<p>I'm thinking an exhaust leak (perhaps the DP flex joint)? Would a failing head gasket produce a hiss like this? Maybe something to do with the boost gauge/lines? I popped the hood this evening and had the wife stomp the gas and the hissing seems to come from the engine bay as opposed to down the exhaust line somewhere.<p>Thanks for helping me find a good place to start problem solving guys!