I removed the muffler and fabricated a tip groundpounder and removed the airfilter box and replaced th filter with a pod filter.  And bike seems to run good. But do I have to re-jet the carb!!!?? Its a 97 savage with 12k miles

Yes it needs to be rejetted. Pull your spark plug and check the center electrode insulator. I'm betting it looks like it has been glazed... Get in touch with Lancer, he's the site's carb tinkerer extraordinaire...

If you literally have a straight pipe for an exhaust system, there will be two main difficulties:
1. Doing something about the increased hatred the general populace has for motorcycles.
2. Getting the bike to run correctly over the wide speed range typically required for street motorcycles.

Unless thats a really skinny straight pipe, it has less power now from the line.

Only way to know if a mod worked is to run some timed tests before changes are made,, then try again & see if its actually quicker,, or just louder

This is probably not entirely accurate,.. but, if you've ever seen a power curve on a dyno chart,... it tends to look like a hill...
Going from low HP at idle, and rising with RPM to the top of the hump, and then falling away...
When you put a less restrictive pipe on,... the hump becomes more of a mountain peak... in other words,.. as you gain HP at the peak, the powerband becomes narrower...
You have a higher peak HP, but it's only available in a small band of RPM...

This will make your bike feel like you have to constantly turn the throttle full blast, or it has no guts at all...
Drag racers like this,... because they get maximum HP that way,.. but, they have to launch at full revs,.. and burn out their clutches and blow engines all the time...