I think it depends on how you are going to use it, and your budget! I went the Turbo Charging route. It kicks in around 4,000rpm and is mental from 6,000rpm to red line. Currently running at around 420hp at 8,000 rpm.
Around town it feels little different from standard when kept below 6,000 rpm, perhaps a little more torque. But at the track I have got as much power as I need. It's like two cars in one, but it was a lot of work to get it to this stage. Its not bolt on and driveaway.
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