The M62 blower is good for 7-8 psi of boost. The stock engine is more favorable to 5.5 psi of boost. The smaller blower actualy spools up faster than the M90. The M90 will not fit under the hood of an Explorer, plain & simple. Since high boost is not possible, the M62 unit works well for the application. We designed this kit to work on a stock engine and stock transmission. If you push the 300 horsepower range, longevity will be an issue. We engineered this kit to offer consistant power increase for reliable dailey driving. We include all of the required upgrades like 30 psi fuel injectors, high pressure fuel pump, 80mm mass air sensor and a custom Apten computer chip. We do all the tuning work and include all of the parts required for the installation.We never said this kit has no potential for upgrades. If you built a stout bottom end with ported heads and special head gaskets ($$$), you could run more boost. You could also run 42 psi injectors and a 80mm mass air sensor. You would have to beef up the trans with different valves bodies and a tweeked computer program.
The trans is definitely the weakest point. That is why our kit is a rational street kit. It is still the easiest way to add 70 rwhp and still have a smooth driving, smog legal, reliable vehicle.
