IRS mod?

[924runnerSR5]

ISR mod?

what exactly is a isr mod?? i have herd a lot about it on the forum but dont know what it is. do u gain a lot of power? how do u do it?
ty much for ur help

 

[fourwd1]

The actual usefullness of the Intake Silencer Removal mod is debatable. It is said to increase throttle response, but does not increase HP. If you Search the forums here on T4R you should find many threads.