Using the J pipe Exhaust on a 260 model

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I have a 260 Sea Doo. Was putting in a performance exhaust I got out of another ski, however it will only work using the J Pipe. I know the J pipe will fit on the exhaust manifold of a 260 but I know Sea Doo left the J pipe already. Is there a reason for leaving the J pipe with the higher HP from the 215? Heat reasons etc? Just wanted to know before I install since I have to cut a hole in hull for this new exhaust. Thanks.
 
Having an both up close, the j pipe is more restrictive. You can however look into flaring the last inch or so for performance gains. Look into it. Some guys did entire flow studies of the two pipes and published their findings in the forums. Look for it
 
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