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Hey guys, I installed a Trust Power Extreme II system on my R33 today, now when I give it a squirt the engine chokes and splutters at 5,000rpm almost on the dot every time in any gear except for first. There is no loss of power except for a bit of hesitation when it splutters. Does anyone have any ideas what could be causing it.

My mods are only 3 inch dump/front pipe, 3inch hi flow cat, 80mm trust exhaust, pod filter and FMIC with the standard solenoid grounded.

I don't have an aftermarket ECU, so does this mean I'll be needing a tune or is it an injectors problem, sparks, coil packs or anything.... It's only happened since I installed the catback, it was fine with the dump and cat done previously.

Any ideas?

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What type of spark plugs are you using at the moment?? you need to be running a heat range 6 plug with a 0.8mm gap, ngk BCPR6ES is what im using at the moment and they are fine so far, my mods are hks silent power catback, decat pipe, fmic and solenoid grounding mod.

yeah it sounds like either a plug or coil issue. try plugs first. either the BCPR6ES as nizmo freak said, or BKR6ES. they are the V groove version of the same plug. also search for the thread on how to tape up your coil packs.

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