Both of which not true. THey are very pricy, and not a simple bolt on.

I wouldn't say they are low cost but do agree you would be diappointed with the performance gains if any. The easiest and cheapest way to gain a couple MPH is prop tweaking.

Cost is competitive to the popular cast aluminum manifolds with stainless risers.

A fairly skilled marine mechanic should be able to install this new header system, on a single, in about 2.5 hours, with time to spare.

Do we have to wait for the ice to melt?

if your HO has the turbonators in the stock exhaust you can remove them for about 50 rpm's

I'm Carl C on Donzi.net. I saw no gain from my $5,000 CMIs. They were a beotch to install and rendered my Q&Q useless above 3,000 rpm. They look good though:). You guys are right, 5,300 would be well into the rev limiter. The shorty gave me a solid 3 mph gain. Hi Frankie.

i believe the limiter is 5150

Talk to BBlades re the prop .
Search your topic on this site will give you hours of reading and hopelully a clear mind .

Boost....let it be your friend.
http://www.whipplesuperchargers.com/...sp?ProdID=1149

Sell the motor and then buy a new one will cost about as much as CMI exhaust. I had a 496 in a Nordic Heat and I sold the motor and installed a 500efi for $2000 and gained 8mph and a lot of torque.