I remember reading somewhere that wiseco piston will knock in this engine until the engine warms up.  I don't know if that's true or not, since I'm still using the factory piston on mine.

I've got a DG pipe on mine, and once the header clears the engine, it's almost a straight shot for the muffler.  It's been a long time, but I don't think there was much difference in size between the DG header and my stock header. 

I suspect you could find a universal one that would be fairly easy to weld in place.

About the wiseco piston, I have know idea if it's true or not.  I just remember reading that somewhere on the internet and wanted to give you another thing to check, if you still have the knock.  Let the engine warm up and see if it goes away.  A call to wiseco might clear that up as well.

You might save money if you used a stock muffler from one of the 400/450 thumpers.  They would be quieter than the aftermarket exhausts, and should flow well enough for anything that the 230 engine can put through it.

No need to worry about loss of back pressure, in that case it would only help power.
Not sure if it would be any quieter though.

Honestly, I'd rather it be quiet if I had the choice.
If an exhaust would make the same or better power and cut down noise that's what I'd be running instead of the Cobra.
I prefer my fuel to make power as opposed to noise, but if a noisy exhaust is the only way to make power then that's what I use.


Kinda like glass packs on an old truck...there's other mufflers out there that do a much better job scavenging and creating power and are a lot quieter to boot, but everyone thinks glass packs sound soooo cool 

You know what?  I just so happen to have a spare 87' 230EH motor lying in my Coca Cola basket.  I was gonna keep it for spare parts but if you decide you want it, just send me a pm.  It would come with all of the wiring and anything that goes to the motor or is attached is included.