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Hi guys, I have just fitted a standard recirc valve to my Impreza as it was fitted with a Bailey dump valve before but this seems to have cut out all of the exhaust pops, I'm guessing this means the car is not running so rich?
You dont always have to have them mapped in, it can sometimes depend on your exhaust as well. mine pops with no effort at all in 4th,3rd,& 2nd just buy lifting off with an afterburner vortex.
Apart from given you bore wash, leading to excess upper cylinder wear, possible valve burning, damage to any cats, dilution of your oil.....no damage at all, and well worth having, just for the noise as Charly said
mine wouldnt pop or bang when duncan mapped mine, well just a little pop that wasnt loud lol but i now took the resonator pipe off which does help it to pop but not loud like bangs when tapping the throttle. but i still have the uppipe still in