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ehh, i would drop the internal personally unless keeping under 10. mine damn near always spikes to 11-12 in wot third gear pulls. id hate too see some one trying to run 15+ on an internal, just doesnt seem liek a good idea. and exteranl wastegates seldomly leak, i would rather loose alil power then send a rod threw my block
step away from that piece of shit. DO NOT buy anything that says turbo xs, stone mountain racing or ss autochrome. there parts suck and will most likely break. if you can wait until around january, id be happy to sell you some of my turbo stuff, namely injectors, turbo, turbo manifold, 450 tuner toys injectors, oil line kit and possibly some other stuff..thats if you wanna wait