I have a 1991 n/a

1) Is Castrol GTX High Mileage 20w50 good for my state of weather? I live in Wisconsin and we get a average weather of 70 degrees as of now. I will be changing to 10w30 for the winter tho just wondering if 20w50 is fine!

2) I need excellent grip tires for both dry/wet conditions! I've heard good/bad news about Falken Azenis ST115. Just wondering if they are worth the money?

3) Will the Racing Beat Complete Turbo II Exhaust System fit on my N/A?

 

i wouldn't use high milage oil it expands the seals to gain compression and you will have to always use high milage oil when you change it then or else the seals will get smaller then they were i would just use castrol gtx 20-50 and no the racing beat turbo back exhaust wont fit your car you will need the n/a version they sell

 

i have a friend with those tires on a supercharged miata, he loves them

 

for oil use Castrol GTX 20/50
Azenis are good for dry. Not recommended for wet. I use to have them in my FC and for about 4 mild canyon runs i noticed very rapid thread wear. They are sticky as hell though.
You will need to use RB full exaust for NA..My friends with NAs have them and love them. Not too loud and dont have a very big tips. I have the RB turboback and love it to death..

 

Some autox'ers use Falkens

 

last question

I have 16x7 fwd rims. Will they fit tires of 225/50R-16 92V B nicely?

thanks

 

Not sure what you mean by a FWD wheel, but the correct offset would be 40mm. With a 40mm offset you can fit 225/50-16 ST115s just fine.

 

the offset = fwd

i've read that it has a 38mm offset

Will it still work?

 

a offset of 38mm would be fine and very close to the stock 40mm.

Of course it is a RWD car... so things like calling wheels FWD and RWD, suggests that you run as far away from that dealer as possible as they have no clue.