Sent 05 Ex to RF Powerboats
#1892
#1899
Registered
Joined: Jan 2004
Posts: 4,480
Likes: 43
From: Tennessee
I swapped out the 525 headers for big tubes on a similar engine and it made over 40 hp more. The headers are certainly too small, but it's not cheap to replace both sets of headers and tails. They have a primary tube that is less than 2", where the big tubes have a 2 1/4" primary and a 5" collector. We also ran every accessory....water pump, alt, p/s pump and 5 idlers.
Eddie
Eddie



