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impeller options 787 99 gsx

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alangsx99

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hey guys ive got a 99 gsx runs great had it rebuilt and bored out to around a 1000cc it runs amazin according to gps speeds @ 62 mph.
heres my question. im looking into doing some more upgrades such as
. Impeller
.intake grate

will this make any difference to my top speed at all or am i wasting my money?

what are some other options exhaust maybe? possibly boring out my exhaust manifold?

what is a good pitch of impeller for adding some topspeed/ good brand to go with?
please help thankyou!
-alan
 
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