Dmann

My post is not asking what size pipes to use, just what will fit around them.

Iam not sticking a 2.5” pipe on my 900hp banger. 

Its all relitive to what you are trying to achieve.

The increase would be from the X cross over not size of pipe.

It creates a big amount a scavenging.

Yeh under the diffs would be safer and straighter.

Motor will need some big pipes.

Plan is to Clevo NA 420-440CI CHI Pro series heads with cam in the 280deg@50thou range. Will need to rev a bit so need good flow.

Sorry, yeh its an XD.

I have though of fuel cell but some nce I will be cutting out spare wheel well thought I might as well make it for a drop in drop tank of about 80-100lts.

It will be on the street occasionally so will have to be legal as possible. I don’t think fuel cell pass do they?

Hi,

plan is to do twin 3.5” to the back hopefully over the diff.

Has anyone done a drop tank to narrow the fuel tank and allow some big pipes to exit the rear?