Hey guys,

I am trying to squeeze more horsepower from my Isuzu Bighorn with 4JG2 intercooler turbo diesel engine. My first instinct is to change the stock air filter with less restrictive one, preferably that of K&N brand. I contacted speedlab*speedlab.com.ph, a local distributor of K&N air filter. Sad to say they don't have stock replacements anymore. However, they offer K&N open-type air filter with minor modifications in the air intake setup at P7,500.00. They claimed it could add more horsepower than that of stock air cleaner replacement. Is anybody among us here have tried Speedlab's air intake modifications. Comments for those who tried are very much welcome. Other modifications that could add more hp and fuel economy especially for 4JG2 engine will be very much appreciated.