Just to share, for those whom plan to DIY the trumpets using stainless steel cups you can get the flange from exhaust shops. Get 4 of them and weld the cups to the flanges and you have your very own el' cheapo trumpets ;)
I've also noticed that open trumpets are often used in racetracks overseas, but in Malaysia (prolly due to hot weather) I noticed MME track cars with 20v retains back its original plenum (and also air box) and still able to come out top in the race. However, most drift cars with 20v prefer to use open trumpet because the plenum is usually too big to fit in and also RWD setup with open trumpet will have colder air intake compared to FWD with open trumpet.
Interesting. Estimate budget to do it DIY style? Haven't seen aftermarket SVT trumpets that can fit into stock plenum.
