what can be achieved with a standard exhaust

im building a 2 stroke 172 ac engine at the moment that needs to look as much like a standard 50 engine as possible whilst still being fast .
im using a typh engine with

pm crank(i got it free and only 100 miles on it i no i built the bike )
172 kit
28 mm carb and manifold
mhr reed block
clutch springs
contra spring
lightened pulley
lightened fly wheel
lightened clutch bell
no oil pump
no electric strart
modded 50 cc air box
malossi sponge
standard pipes
flowed cases
widened transfers
matched cases to kit
gear up
and i wasnt sure about a derezzed cdi as im not sure the pipe will allow it to rev very high anyway

what kind of rev range and power will a standard pipe allow me to reach .and is there any way of making a stadard pipe perform any better .im sure some people will cuss me for tuning up a bike and keeping a standard pipe and a 50 air box on it but i have a job now and money and ahve wanted a stealthy bike for a while so why fukin not lol. if i ever get bored i shall just rip the pipe off put a 172 pipe on it and a modded 125 airbox and gain somemore speed but WHAT DO YOU THINK POSSIBLe

 

get a sip stainless steel downpipe and match it.