What is the cheapest way to get the most HP out of my NT 13b rx-7?
It has K&N intake system, and no mufflers and no pre-cat converters,just the stock main ? Just bought it and was wandering what should be the 1st thing to do to get mre HP?Any suggustions?

 

cat back will help, getting rid of the main cat if you can do so without emmissions testing problems, after that not much without engine work. no real way to be legal and get anything over 190~200 hp without nitrous. if you want serious hp you picked the wrong car. while a modded n/a can be fairly quick it is nothing compared to a modded TII. i've owned quite a few n/as and i've humbled myself that it will never be a v8 eating rotary monster.