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Just a quick note on performance
Companies like RS barn have been building these engines for race cars and performance for years, and you not gain any real power without forced induction
The best engine that RS built was just over 300bhp but the cost was huge 10-12,000 dollars I believe
Chasing power seems to be a full on pass time for these cars and is a real waste of money, if its not fast enough you bought the wrong car
1992 968 Coupe
1986 Honda VF1000 FII
2016 Volvo XC90 D5 R-Design
Posts: 2,494
Threads: 45
Joined: Jan 2015
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The parts problem only strengthens the reason not to tune your car up
At 150mph they are more than fast enough, and searching for more power becomes a expense of diminishing returns
With all those parts added did you have the valve seats recut and the guides checked, one of the biggest power losses is valve rattle in the seats and blow past, at the mileage of my car, a full head rebuild would probably return 40 bhp to the tank,
1992 968 Coupe
1986 Honda VF1000 FII
2016 Volvo XC90 D5 R-Design