my freind has a 2001 volvo s40 turbo automatic, can anyone give me a how to guid to install a boost gauge? and how much is the stock boot pressure on the turbo? and how much can i safely set it to? and how could i install an axel back exhuast on the car? ik i prob have to get a unversal muffler but i have no idea as to the length and the flange that is used. for the time being id like to just use exhuast clips till i can take it to get it welded professionaly. what are some other things i can do to increase hp for this car as many manuffacters dont mke after market parts for it. please help thanks in advanced for al the newb questions

 

i ment boost controller