Trying to do a custom exhaust

[lcochran]

I own a 75 cb750F with stock carbs and air box.  I want to put a custom exhaust from the header back.  Leaving the 4 into 1 header on the bike and slipping on a simple turn out pipe a tad shorter than the current exhaust.  My question is whether or not this will affect my Backpressure so much that i will need to rejet, add performance air filter or do any combination of AIR/FUEL changes.  If anyone has any experience with this shoot me a message

[Re-run]

In most cases, a simple exhaust change like that will not require rejetting. Seldom is tuning the a/f required.
now if you had tuned for a 4-4 and then went to a really open 4-1, then you might need to tune but rarely rejet.