You definetly want to run premium fuel. I have had conversations with Scott @ IPD and he indicated that the lower octane will cause the engine to put out less HP, the knock sensors will detect and adjust. I have the IPD ECU & MBC and have set boost at 15 PSI. Scott actually reccomended 14 PSI (what the ECU runs), but I have not noticed any problems @ 15 PSI. Interestingly, there are guys running 17-18 PSI in UK, but they get 98 octane fuel, where we only get 91!
As far as the exhaust install, I am too lazy to climb under the car, my Mech installed the dual exhaust in 1 hour.
Wills
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98 R Wagon IPD ECU, 2.5 Dual Exhaust, Dawes MBC, 94 854 turbo, IPD Goodies, 92 740 Rag Wag
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