My brother and I have both been very happy with the Powermaster 9510XS in our GTOs. Works great, highly reputable U.S. company, and all kinds of room with headers, etc.
https://www.summitracing.com/parts/pwm-9510
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1966 Pontiac GTO (
restoration thread)
1998 BMW 328is (
track rat)
2023 Subaru Crosstrek Limited (
daily)
View my photos: Caught in the Wild