mattwilcher

Took the 04 GTO to the dyno on Friday. Just did some base pulls to see where I am at currently. She made 332 rwhp. I am going to remove cats (just for testing purposes and track of course) change spark plugs to TR6 NGK and head back and have the caar dyno tuned. The internet tune i got in all actuality may have been a waste. It is running a bit rich. I know , I know an internet tune could never be as good as a real time dyno tune. I will post back results later to show what differences it made.

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2004 GTO Yellow Jacket LS1 5.7, Kook's 1 3/4" LT's with SLP Loudmouth II, Automatic Trans., Svede OTR CAI, West Coast Speed Fast re-acting IAT, E3 Plugs, MSD Wires, Nitto 05 Drag Radials.
SCT Tune by Mike @ morepowertuning.com
13.107 e.t.

FNG69

Will be interested in seeing what the TR6 NGK plugs do for you. Have a 04 also. Engine is stock with JBA shortys, SLP 05 exhaust & X pipe, K&N air filter. DYNO was 338.0 HP.

mattwilcher

FNG69, did you have it dyno tuned? and are you running cats? The tuner guy told me with a slightly colder plug than the factory plug he could put a lil more timing into the tune. Not expecting to see any gain simply from the spark plug change. Man that would be awesome if it were that simple!

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2004 GTO Yellow Jacket LS1 5.7, Kook's 1 3/4" LT's with SLP Loudmouth II, Automatic Trans., Svede OTR CAI, West Coast Speed Fast re-acting IAT, E3 Plugs, MSD Wires, Nitto 05 Drag Radials.
SCT Tune by Mike @ morepowertuning.com
13.107 e.t.

FNG69

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Yes, still running the cats and running the SLP Loudmouth II like you. Been real happy with them. Owner of Wichita DYNO as a 04 himself so he knows all the tricks. One of the best things I did to the GTO!!!.. Les....