How much hp did the tuner add to the car?
Bought 3/5/11: Torch Red with White Stripes, 5MT, C&L Cold Air Intake, DiabloSport Predator Tuner, GT500 Strut Brace
Hi Lamps3, Supposedly around 20 whp, but its a pre-fab tune that came with the Predator: I used the pre-fab 91 octane C&L CAI tune. I can believe it if it is 20whp, it has added significant noticeable power. I am not sure if it would be worth having it dyno tuned, car does not appear to knock and seems to be getting normal gas mileage. I will probably get the cable for the predator for data logging to my laptop.
Also, the price on these things has come down substantially with the new 5.0 out. I got mine for ~$14-15k and it looks almost new. The only other competition would be a LS2 GTO for that price and the Mustangs are probably less likely to be beat up since many non-enthusiasts buy them relative to the total number sold in the US.
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