Originally Posted by bcredliner (Post 978007)

I have looked at headers also. Everything I found I think was way to expensive for too little gain. You could add an X pipe. It will deliver some of the scavenging benefits of headers and would not be that expensive. With closed exhaust the X pipe might be close to header benefits.

I don't need any more torque so I am going to go with electric cutouts that are remote controlled. I can open them any amount at any time. I don't do welding so I have been calling around to find someone that will do the job before I order them.

I had the nitrous installed at an Indy BMW performance specialist shop. I wanted experienced techs. The methanol is from snow performance and a straightforward install. I can adjust the flow to come in at any injector pulse width and be a full charge at any width as well. Nitrous cost was just under $4,000. Took 3 days to install and I had extra testing done so that took almost a week.

Originally Posted by caisson12 (Post 978054)

Rather than an M5 why don't you try to locate a wrecked X5M and you will have all the parts you need for a 525 HP X........:dunno:.......OR, better yet..... just swap your X for an X5M??