I have a Evo X GSR and I want to be in the 400 HP! What can I get to get up there... I already have full exhaust from turbo manifold to the back.. I don't know how much that gives me but I know it's not enough.. Do I have to open the engine to go up to 400?!

 

Upgrade fuel system ie injectors, 3 port boost controller and turn up the boost. Upper intercooler pipe will help. If you still can't get close you may need something like an fp green to get there if you don't have access to E85. Almost forgot you'll need a tune lol.

 

^^ plus, intake and cams. might as well go for the 4" ic to fight heat soak. e85 will be close but pump... maybe not so.

 

Can I use E85 on my Evo X GSR 2011 with just full exhaust upgrades?

 

you will need pump and injectors.

 

you can use e85 with any mods or none as long as you have the injectors and fuel pump to support it.

 

I wouldn't go e85 unless it is readily available

 

I'm surprised the exhaust didn't get you to 400hp

 

E85 def isn't easily available

 

I don't think it's possible to make it anywhere near 400 with just an exhaust (although maybe you're kidding?). You'd need the intake and a tune to really take advantage of the exhaust anyway -- although I've not really seen many people (maybe right around none) say they were at 400+ on pump, IIRC.