Anywhere from 1-2k for a good charger. I pasted the rules below.
22. The vehicle is limited to a 2.6 inducer bore single turbocharger. The compressor wheel must protrude into a 2.6” bore for 1/8”. The inlet will be measured using a 2.605 inch plug, the plug must not be able to enter the inducer bore. A stock map width enhancement (MWE) groove must be inside neck area where intake cover is measured. No MWE groove will be allowed that has a width greater than .200”. All provisions allowing air into the wheel other than via the bore and the MWE groove are prohibited. The vehicle driver will be responsible for making compressor wheel accessible for tech personal to measure bore and be able to inspect compressor wheel. All primary blades must protrude into the bore.