I was wondering what the best supercharger pully size would be for my bonneville soon i will have NGK tr6 and tr55'*/ if possible steps on removing and replacing the original one thanks.

TR6 is two heatranges colder than stock. Why are you doing that BEFORE the pulley? They'll foul out on you.

IF you have a scantool AND fuel pressure gauge, go with a 2.2" pulley and be prepared to buy a 2.3" or have your exhaust manifolds ported if you get KR.

If you don't own BOTH a scantool AND a fuel pressure gauge, go with a 2.3", and get a running scan somewhere anyway.

The reasons? You have to know if you get KR. I can destroy your engine. It'* not just a plug/play thing. In addition, most cars of your vintage are showing signs of low fuel pressure which is not apparent with a stock pulley, but VERY apparent after adding a smaller pulley/more flow. Running lean at the top end under boost causes BOOM.

Moving to Forced Induction

so far I have a 80 series muffler, K&N RX -4750 X STREAM CAT, 180 Drilled therm and I was wondering what are the best plugs to go with a new pulley? for WInter and for Summer( I live in Michigan, cold)

After the pulley change, NGK TR55 V-power plugs gapped at .055". They are one heatrange colder than stock.

so what size pulley best fits my need

I already answered that question. It depends on whether you have a scantool and fuel pressure gauge.

Both should be purchased BEFORE a pulley ideally.