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  1. Turbo PSI dropped after exhaust change

    Basic Help & Repair
    Hey Guys. Really need some help. My Aristo Swap 2jz gte twin turbo IS300 had 3 inch straight pipe with catback at 14.5 PSI. Unfortunately, I had to change my exhaust to 2.5 inch with filters due to law issues and I saw the PSI drop to 7 PSI and I have lost significant power. Is there anyway to...
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