NJSierra

Yesterday I was watching my recorded episode of Horsepower TV and they did a spark plug comparison using a LS1 engine on a dyno. The engine had some extra's in it. They mentioned the E3 plug by name and they just showed the other plug which looked like the Bosch Platinum +4. They did different runs with both plugs installed and they stated they made sure the engine was at the same temp when both plugs were tested.

With the Brand X plug "Bosch Platinum +4 the engine dynoed like 407. something HP.

With the E3 plugs the engine dynoed like 412. something horsepower.

So there was approximately a 5 horsepower gain with the change of the plugs.

I wanna say that the so called factory plugs dyno run was 402 or 403 HP.

Does everyone think? I read a comparison chart before purchasing my NGK Tr55 IX plugs and they had shown different plugs and their dyno runs, on what engine I dont know, but the difference was anywhere from 3-4 extra horsepower on each dyno run for the NGKs.

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SOLD: 2006 Torrid Red GTO- Superchips, Poweraid TBS, AEM CAI., JHP Sports Gauge Pod, NGK TR55IX Iridium plugs, Vinyl decals/inlays, Lloyd custom rubber floor mats/cargo trunk mat, window tint, resonator delete, and Flowmaster Super 44's!