Originally Posted by hector mestre

Take your plenum buy a round pice of nylon same diameter as your plenum and work it with a power tool untill you have a triangle with the back the same curve as your plastic plenum and you put screwes from the out side to hold it in the center of the plenum and you are going to have the same thing they sell for $1000.00 the exhaust i made in a mufler shop whith 3 1/2 tubing all the way back whith silencers made of staianless steel sheet metal and in the center i had 3 1/2 perforated metal with fiber glass arround them between the two tubes no catalitic converter they were very chip i made them in mexico lavor cheep and hand crafted of first class the turbos were 24/24 i made them 24/20 with a mitsubichi wheel and got the ecu tuned i am doing 2.7 bars whith water methanol ijection $299.00 in ebay which rises the gas to 116 octanes you can use and more small things like injectors and another fuel pump in tandem there is nobody on the track is faster than i ah and i forgot 100 hp more with nitrous oxide
which i never use because the car is so fast i dont have the need for it.
I hope i helped you
hector