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I just recently purchased a single PSI pipe for my 1989 indy 500 off of ebay, however, no jetting specs or info came with it, and i was wondering if anyone had an idea of what the mains change to, if any change at all, from the 290 stock. thanks
 

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I would contact psi for instructions....
 

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Originally posted by xcr440
[br]I would contact psi for instructions....
Agree 100%

http://www.psipowerinc.com/contacUs.htm
 
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