On my G35, I dynoed with FI resonated test pipes and 3 hrs later dynoed with HFCs. The results...1whp gain only at the very top of the rpms. It actually lost a few hp down low compared to the HFCs.
The 0-to-miniml gains with test pipes, mixed with the rasp and gas smell make me highly discourage others from getting them.
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Ryan - 2014 Stryker Green Viper
Gone - a few Vipers and a couple turbo VQs
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