1990 JS440SX

Myself said:

If you're keeping it simple then why not just bolt an adapter plate on and run a 650sx manifold and pipe?
HINT: ......a stock 750 manifold is actually slimmer than a 650 manifold giving a wee bit more clearance to the hull.

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So I do actually have a 650 West Coast manifold + one of the 701 adapters. But idk it's not the right way to do it. The 650/750 ports being rather small seemed to me like an issue when I had the setup on a 6M6. Let alone a 61x/61x with substantially larger ports.

Itll be my luck I go that route. Then 1 week later a 61x manifold lands in my lap and I'll have wasted time & 3 gaskets

mrfist9 said:

no way!! I love the nose exit

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If you love smoke in your face this will do the job , no doubt .

A stock 61x exhaust works well if all the plumbing downstream is opened to 2.5 inches. This system has no tuning so it must have minimal back pressure. If the exhaust plumbing is small then use some kind of tuned pipe.