whas tha best and loudest blow off valve i can get for a 94 mazda rx7 for tha stock turbos?

 

the stock is loud enough!!! You will need to vent it to the air. To do that, just find the hose that has the A.B.V that goes to the stock air box, pull the hose out the air box, cap the air box with something. I use the rubber piece off the bottom of a old lady's walker. Its best to do this instead of buying one. If you do buy one you will realize that you wasted you money. The best bov are greedy Type R(for single) Type S for twins, Tial, and Turbonetics. Now, Turbo XS, Apex-i, Blitz,and XXX are kinda ricey if you ask me. I have a turbo XS with a t-78 and It gets very anoying sometimes. The bov was on the car when I bought just so you would know...