After market exhuast and air filters

[say2345]

I have a 5 hp Briggs that was originally a go-kart motor. My son and I have built a new mini bike frame for it. I'd like to change out the exhaust, and get a cool looking air filter for it (the orig. wasn't there when we purchased it). Anyone know who makes them and what the correct part numbers are? Here is the info. Off my motor.

Model Type Code
130232 5111 01 91111 507

I am not very good at fixing small engines, but we are learning. I have spent hours on eBay and searching the web, just not exactly sure what size's to be looking for. Any help would be great. Here is a picture to give you an idea. Also wouldn't mind switching out the carb. if its not to hard.

 

[JustEnough]

The 5hp Briggs was a very popular engine for karts, and probably still is on dirt tracks in the east.

Many parts are available, but the exhaust pipes usually do not have the correct bends to use on a minibike. Sometimes an exhaust rotator can be used to get the pipe in the right place:

Exhaust Rotator