[96riviera18]

if it slips it wont screw up the car just lose some boost at high rpm range. most people run 3.4 pulley fine with the stock belt and tensioner. if you want to buy a 3.5" tensioner pulley for like $15 go for it. it will not make any difference under 4k rpm but you may see a small amount more boost/hp above 4k rpm. (i just depends on how often you floor it and rev up to race) the tension is very easy to install, (lots easier than s/c pulley) just use a 15mm ratchet and losen the bolt by pushing the ratchet towards the seats. (the s/c tensioner is shown in the manuel that came with the car) its the one that is right below the s/c pulley.