This is a modification we made to a replica RMF header for a H2B swap.

 

Great stuff, Was thinking of doing this 2!!

 

looks good, I should do this to mine since mine broke off right where u mod it at.

 

whats the power gains with the 3inch

 

We have seen 230 whp on a dynojet with a stock motor, with intake manifold, 65mm throttle body, 440cc injectors with a modified header on a H2B setup. Of course with a manual tensioner conversion and balance shaft belt removed. I am not too sure what the motor will do without these bolt ons

 

any pics from the bottome to see ground clearance?

 

any body eles ever did a 3inch collector

 

i left mine at 2.5 but had to cut and weld just the same

 

what you did will not help the power one bit.The hole at the exit is 2 1/8 for a reason.But you have a copy of a header that was made 7 years ago anyway so go ahead and do what ever you want to it.

 

hot to cold!

 

any dyno numbers

 

x2

You picked the worst place to modify that header . .

 

OP

Look's like you killed the throttle.

 

so how would the correct way been if there is a correct way?

 

You could cut it off there, get a 2" to 2.5" transition and make the collector sort of a high velocity merge.

 

would it be woth it to get something like a burns 3 in collector put on or not?

 

Id like to see the correct way to make the modification so i can do this myself as well and save some money instead of pay well over 1grand for the ssr h2b headers.