I have a 2009 is250 AWD. Just did my first mod and put on the Fsport intake and am loving it. I am wondering what the best exhaust mod would be to increase HP without increasing noise. I know HP gains will be minimal, but any little bit will help, just want to keep it quiet. So catback exhaust? Mid pipe? Resonator delete?

 

if you have AWD all you can really do is axel back. since the mid pipe isnt the same on the RWD vs AWD. not really gonna be much to any power gain. not one you will be able to realistically feel

 

Quiet axle back should be Tanabe. There is a knock off Tanabe called M2 selling for less than 300. They are quiet but you can hear the low rawwwwwrrr when you drive hard.

Don't do midpipe and don't do cats delete, they are raspy and loud for your taste and increase only 1-2 HP max. They are mainly for louder sound.

 

Fsport exhaust! I love the exhaust. But it's expensive lol