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Message: <blockquote data-quote="blown98gt" data-source="post: 530736" data-attributes="member: 11284">manually retard timing and you can not recirculate all bov's because a bov is for venting into the atmosphere..a BPV is what you would need or a bypass valve, vortech bypass valve can be recirculated. There are 2 types of setups for MAF, blow-thru and Draw-thru... to go into a brief explanation, draw thru is MAF is on the end of the power pipe and all the air sucked in before the s/c is all metered.. a Blow-thru which is the best for tuning is basically the opposite, air is sucked in through the power pipe, into the s/c blown out and through the piping.. the MAF sits basically in the normal spot it would with an intake pipe (no s/c) the air is metered before put into the TB.Draw-thru setups CAN NOT VENT INTO THE ATMOSPHERE.. under no circumstances can they ever be without it screwing up everything.. the air is already metered so when you dump metered air well big problems..in a blow-thru setup the BOV/BPV are usually closer to the outlet pipe of the s/c and can either be vented into the atmosphere or recirculated into the power pipe.. since the air is not metered then you can dump it where ever. best thing as far as getting the car running right is let someone tune it, i mean bottom line is you do need a tune...</blockquote>