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400rwhp is attainable without porting the heads. If your on a budget I would start with a CAI, tune, smaller blower pulley, underdrive pullies, smaller crankshaft pulley, LT headers, midpipe, and see where that will put you. If your not at 400RWHP I would think your damn close. Than you could decide on porting the heads or not.
Thanks for the input. I realize I can get close to 400 RWHP without porting the heads. I may have to yank my heads in either case, so I was just curious if anyone had tried it and what the results were.
Also, I live in CA, so LT's are just about out of the question, but maybe some mid-length headers instead. I suppose there must be a few CA leagal CAT assy's out there... I have always heard bad things about running underdrive pullies with the SC, not sure if its true though. Perhaps one of those MoSaleen Idler systems instead. A smaller crankshaft pulley would definitly push more boost, but I believe the 66mm pulley is about as hard as you want to push the Eaton anyway as it starts really heating the intake charge.
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