Hey guys.. I just put a new Hi flo 3" TBE on my rex.. And it seems to be backfiring heaps. i could be cruising down the freeway at 100km/h and theres a few loud pops. Then after i change up gears, after the gears engaged, it pops once.. then keeps going. Then sometimes changing down gears it backfires a few small pops..

I know the cause would be the fuels running rich or whatever, but how do i stop it? Because im starting to get worried now. Most of the time its the normal deep noise of the backfire. But a few times its almost like a really loud crack. I dont know whats making it do it.

Input would helpfull on how to fix it. Thanks

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MY02 WRX STI

Full Cosworth Internal Rebuild, Autronics tune, Cold Air Intake, 740cc Injectors, 3" TBE, 600hp Fuel Pump