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well i only have K&N intake, o/r midpipe, and catback. But i just put on my o/r midpipe and i heard since i took off my 4 cats then it wudnt run right, and if i get it tuned it wud help. Also i can go back anytime i do another mod to get it re-tuned for free.
it's really not worth it until you get like full boltons or some sort of forced induction. you're probably not going to pick up more than 10HP from a dyno tune. the $500 sounds about right for the price though.
I think you are aiming a little high. 300 rwhp? I would guess closer to 260, I am not sure though. I don't remember off the top of my head the hp the 98 cobras came with. I though about 280 flywheel? Correct me if I am wrong.
yeh 305 at the flywheel stock. sS about 12 for intake, 15 for SLP 1' catback and 15 for o/r h-pipe? Stock 98' cobras dyno at 260, so 300 sounds good right?