Originally Posted by five.slow
all you really gotta do to make over 420 on a mt82 car is delete the cats and get a tune... 401 with a tune isnt all that, sorry man its normal. tune with off road h and flowmasters made 426 on my old car. gained like 3hp with the jlt.
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426 needs a little more than that, if you aren't on a happy dyno in 45-50° weather