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Showing results for tags 'Cat Gutted exhaust boost'.

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Found 1 result

  1. Tim0546
    Hi guys, had my FG tuned recently to 17psi but shortly after it became really quiet and laggay as the hi-flo cat had started to collapse, We decided to hollow it out to see what difference it made, the responsivness of the car increased and it hits boost much better but it no longer hits 17psi ??? max boost is only 15psi. I thought removing the restriction would possibly cause overboost not a loss in boost? if anyone could explain it would be much appreciated Thanks, Mods are as follows; Hdi Cooler 4" battery side intake GT3540 with ar.70 comp cover ported wategate 12psi actuator 4" Dump 4"in 3"out Cat (5" body) standard 3" Catback with rear muffler removed siemens 60lb Walbro pump SCT Engine and ZF tuned
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