don't do that... if you're going to that, you should've bought a V8. i know guys with a 2007 4.0 mustang that have gotten a kenne bell s/c and are doing 273 rwhp/272 rwtq at 7.1 PSI. i think that's one of the best things about the s197's... you can pretty much slap a blower on it and get it tuned without a huge worry. stock internals are probably rated at about 350HP before they reach their limits.
seriously, i have a 3.8 V6 and was looking into all kind of performance mods and engine swaps. really do your homework before you take on any kind of challange.
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K&N CAI, BBK TB, Pacesetter dual exhaust adaptor, Magnaflow dual exhaust, Steeda Tri ax shifter, GT front brakes, 8.8" rear, 3.73s
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