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A couple of additional points I would like to add: the 1999 9-3 SE has the Mitsu turbo which is the same as the Viggen. The '99 model year is the best platform for OG 9-3's to make big horsepower per $$ spent mainly because it has the better pistons as stock, the T5 management system , and the mitsu turbo. This requires less money to tune for big power and no piston replacement requirement unlike the newer years. The stock Mitsubishi turbo can be upgraded with the #6 9000 Aero turbine housing and a 18T or 19T wheel. The physical space the turbo occupies does not change. The #6 replaces the stock housing by removing the retaining ring and carefully installing the other housing. No turbo rebuild required. The larger wheels are installed after machining the inside of the compressor body to match the larger "wheel". Conversely the 9000 Aero turbo is almost a direct bolt in option. The compressor housing would need to be swapped and a bend in the wastegate rod may be required. Again, no rebuild required. That is all that is required for this install/ upgrade although software upgrades will take the power up dramatically. The benefits of this: better upper RPM response-it takes longer to run out of "steam" more power, and lower EGTs. I was comparing the stock 9000 Aero to the larger 19T wheel because, as far as turbo upgrade steps go, the Aero turbine housing is step one. This housing bolts right up to the stock manifold-the openings are not similar but there is no restriction on the turbo's end. The manifold just flows into a greatly enlarged turbine cavity through the smallish stock exhaust manifold opening. As mentioned earlier the porting of the exhaust manifold is a good idea and will provide additional performance benefits meaning more top en performance. To my mind a ported exhaust manifold mated to the the #6 turbine housing and the stock 15T may give the best daily driver performance possible...good low RPM/little lag and more top end high RPM power. The next step would be the larger wheel if looking for more power at the top end. Larger wheels flow more air and create less heat gain than the stock 15T wheels at high RPMs thereby producing more power and less risk for detonation (heat in intake charge=less oxygen per pound of air. Less oxygen per pound of air increases probability of detonation and poor ignition and, more importantly, reduces the amount of power you can make at that pressure level). I base these observations on my 9000 Aero's performance. Everything is a trade off-some of which can be overcome by good engineering (hardware) and some by software both of which cost money. The '99 models are the "best" starting point for high output VS dollars spent with the "SE" being the very best because of the mitsu turbo and, possibly, the T5 cams- I have the T5 Aero cams. There are differing opinions on the '99 2.0 VS 2.3 Aero cams. Perhaps someone with experience in both will provide a definitive answer.
->Posting last edited on Tue, 29 May 2018 09:56:20.
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