Well i think it depends on the vehicle. You’d be wasting your hard earned money if you bought a new vehicle and threw in K&N air filters, strut bars, lowering suspension as a new vehicle is rather raw and hasn’t gotten used to the driver’s driving style or enviornmental conditions, e.g road, climate etc.
BUT is you own lets say a 1992 Honda Civic VT-I which already has been trashed, worn out BRIDE seats, worn out circuit board that does not engage valve train system properly, then by all means mod the vehicle with ZIGEN 5 rims, bodykit, GT wing and stuff.
Most vehicles come with sports accessories that do not actually boost the performance or handling of the vehicle..and if your vehicle is a V8, 5.0 or above i think it’s good enuff. If you want more kick there’s always the air/fuel ratio controller.
The ECU increases fueling when it thinks that more air is flowing thru the engine. These devices allow you to reprogram the air/fuel mixture to match the modifications to the engine. However, it is best to tune it using a dynamometer or the very least, with an Air/Fuel Ratio Meter so that you can adjust the air/fuel mixture correctly. Check out models from ADM, HKS, Fields, APEXi etc.
