Hey guys I got a 99 a4 1.8t aeb
i put a turbo back exhaust on
3' turbo inlet pipe
intake
n75 race valve
nock off 007 dv
k03 turbo with about 15k on it
swapped out tranny with lower mileage
stage one apr clutch
H&r lowering springs
just got mbc but havent installed yet because when in high rpms past 5k im getting almost like a surge. I replaced my exhaust manifold to turbo gasket and studs using thred lock and still get same thing. Maybe I got a vacuum leak or something? Only on open throttle is when it occurs. What to doo??? I only have 128k mileage on car and motor

 

Also boost is stable at 10lbs the whole way

 

Sounds like you're more than ready for a chip to kick the boost up. With your existing mods, your car will really come alive.