All Isuzu 4 & 6 cylinder gas engines have asthma. Above 4000 or 5300 RPM, depending on engine, the camshaft, cylinder heads & manifolds simply do not allow any more air volume or velocity to enter the cylinders. There are 2 exceptions, that is the 3.2L DOHC High Output engine. The intake manifolds are completely different design that allows more higher air velocity. The later 3.5,L DOHC engine with switchable variable velocity intake manifold.
Installing any aftermarket high performance air filter regardless of which type, brand or model will not increase the performance of the engine.
Installing any aftermarket high performance air filter regardless of which type, brand or model will not increase the performance of the engine.
