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S63 doesn't have a MAF vs the N63 which has two.
Flash tunes are pretty much all canned with slight tweaks. RK is the only one producing an intake since I haven't reproduced mine. There are like 10 exhaust options but I've yet to see a side by side of who's is better so I'm going custom myself. BMS stopped making the JB4 (they pulled an 11.7 on a stock truck running E30) which sucks for others because it's been helpful in me sorting my issues and now I'll be using it to control meth. Price wise from top to bottom is Pure ($5k), Turbo Labs of America ($1.5-$2k) or the Kunigawa ($280) compressor only wheels on eBay. The only place I've read about that'll built the trans to handle over 750hp is Nizpro in Australia for $5k in parts alone.
That's still a lot of fun that can be had in these trucks, but after that we're pretty much on our own.
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