Ski Nautique Y-pipe exhaust

mspalatro wrote: The engine does have cam that is supposed to bring it up to 300hp. Everything else is stock.

Don’t know who sold you the cam, but you’re not going to get 40 extra ponies from just a cam, with stock heads and intake.

I am going to with Y conversion. Looking through some old threads I saw there was a boat dr that sold the conversion kits. I checked his website and I don’t think he is still in business. Do you have any online recommendations to buy parts?? Also for the install, was there anything you had to take into consideration like the placement of the Y fitting?? And did you run hose right from Y to manifold or did you use additional fittings for bends??

The engine does have cam that is supposed to bring it up to 300hp. Everything else is stock.

mspalatro wrote: I am looking to get rid of my inverta flo on my 1990 Nautique. Is there much of a performance gain to go straight dual vs y pipe?? I can see straight dual is a much bigger project.

It will sound different, but it is very unlikely there would be any performance gain from going to straight duals with anything near a stock engine. Mostly likely you would see no difference, slight chance the duals would be slightly slower.

I don't have any photos of my boat but it looks identical to this.

MNLakeSkier wrote: Throttle out- anyway you could post a pic? I have an 89 as well and am about to do the same and just want to make sure I route everything correctly. Many thanks!

I did a muffler delete on our '89 about a year ago. My son uses it so I hadn't driven it until last weekend. I really like the way it sounds. Not too loud, slight drone while cruising but not bad and sounds great wide open. For some reason the '89 was much quieter than the '92. They both have the same muffler except the '89 has smaller diameter risers and less HP.   I like the way the '92 sounds so I wouldn't delete the muffler but I'm glad I did it on the '89. The only issue I had was getting the muffler tubing to bend downward after the risers. It may have been the type of tubing I used. I can take some pictures but it will be a few weeks.

I restored a bubbleback last year. It came from the PO with the Y-pipe which I've left as is. I would have bought a new hullhugger muffler until I saw the price! Noise doesn't seem too bad to me but I never heard it with a muffler.

Throttle out- anyway you could post a pic? I have an 89 as well and am about to do the same and just want to make sure I route everything correctly. Many thanks!

I'll try to get a sound clip next chance I get.

Just an FYI
I literally just did this conversion on my 89 using a Centek y-pipe. I fired it up for the first time yesterday and the sound difference is NO where near what I was expecting. At an idle sitting on the trailer it honestly would be hard to tell a difference, it is ever so slightly louder but more just sounds a bit different. At WFO it could be a completely different ball game but I won't know that for about a month yet as I'm replacing my interior.
My buddy's got an 88 SN and his on the trailer is still much louder than mine at an idle, and sounds better as well. My boat slightly edges his out performance wise but man the 88 and older Nautiques sure do sound perfect lol.

TRBenj wrote: . All that hull allows the a v-hull to float higher- the Bfn doesn’t dunk the chine by much, whereas the small flat bottoms float with the chine nearly a foot below the surface.

That's how photos of both boats look to me.

What about the noise levels from lack of mufflers?

I have a feeling this is more an urban legend,does anyone have actual experience getting water in? Someone somewhere probably had a problem with a high overlap cam and over the transom exhausts,some other guys had trouble with big sport fishing boats backing down when fighting fish and then PCM's marketing dept who would sell an engine for any type boat said that their pyramid style exhaust were better than the logs for that reason. We just don't back up hard,we spend most our time going forward.

Then you have plenty of time to have those cool looking logs.

If you're elbows are significantly closer to the waterline than they are in a flat bottom, why not get some proper elbows or PCM manifolds and avoid all that pain when your weekend suddenly turns to saving your engine because it filled up with water?

I still have logs and straight pipes and no problemo.