I have a 2003 RD688s with a AMI 370, the VIN is 067246 I would like to bump up the horsepower by about 100 What do I need to do for this increase? I’ve read other post on this site about offset camshaft key ways and swapping in a older E7 exhaust manifold,turbo and 5” exhaust to allow the engine to breathe better. I prefer staying with factory style injectors if possible since I’ve had aftermarket injectors in the past and found them to be unreliable. So with the above information what woul