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aftermarket Exhaust

1K views 7 replies 6 participants last post by  DiamondPerformance 
#1 ·
What up


Just looking for opinions, I have a 454 mag 385 hp. What is the best all around exhaust for this motor,

There seems to be quite a selection for this motor. Only adding the exhaust. What is a good price as well I know I might have to increase the prop size, But do I have to recal the ecu unit as well

One last thing is the K&N filter worth the money I have seen in test that they claim 9 hp and an exhaust is about 50hp give or take

Thaks for the info in advance

Mark
"AKA "
MR HLB
 
#7 ·
I put a set of EMI Thunder's on my last Nordic with a 300HP 454. Saw a two MPH increase. Put the same headers on a Nordic Rage with a 385HP 454 MPI Mag along with a K&N Flame arrester and saw no difference from stock. I guess it varies from boat to boat.
 
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