Quote:
Originally Posted by AussieBRZ
If header was already catless then it's likely ok it may make turbo spool a little different and possibly hit boost limiter but unlikely just log data and check but should be fine
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It was actually the stock catted header before, and now it's an aftermarket UEL catted header. Definitely spools differently and the gains have shifted toward the higher RPM end. Amazing on E85, and 91 feels like shiite by comparison (which is expected).
Just wondering if there would be any benefit to re-tuning specifically at 91 but my tuner said as long as they adjusted the tune on E85, the rest scales automatically based on ethanol content level.