Not Ranked
I was told by Firefly to expect a 20 to 25 hp increase over stock SPF sidepipes with my engine combination as other pipe manufacturers or fabricators also claim through testing. No doubt in my mind I'm convinced Firefly sidepipes are the best money can buy. Yet, I have a lot of upgrades I'm doing this year and the money saved buying pipes from Performance Engineering at half the price with similar performance expectations sure helps the bank account.
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