wats the best turbo to get to max out in the 300's hp i dont want more from there but i heard the ko4 tops out at 250 so idk what to get i dont wanna go bt at least not yet

if you want low to mid 300's go with the gt28rs. thats if you do have a 1.8t. you can go with an apr stage 3+ its a little pricey but willbe able to bolt on with stock internals and safely push over 300. now if you have high miles on your motor, i would suggest rebuilding your engine first.

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99.5 Audi A4 1.8TQM
APR stage 3+, JE Pistons,H-Beam rods,
full 3 inch exhaust, 355mm stoptech brakes, koni adjustable coilovers, 18 inch rondell rims,
short shift, forged diverter valve,
manual boost controller, light weight flywheel and six puc

best gt28rs
cheaper t3t4 50trim .48

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FACTS > followers
197whp and 292wtq with no chip on stock ic, airbox and catback
AEG crank +Scat rods + 83mm Wiseco pistons = CincyTT Version 2.0T