What a difference! Just installed some gutted and bored out secondaries and it made a pretty noticable difference. They were bored out to 36.5 mm and all the rods, butterflies, etc. have been removed.
1turbofocus did the machine work and has a jig set up to do the duratech secondaries. So if you are interested, he can do them.
From the prelimainary test drive it feels like about 10 hp.
All you boosted guys NEED to do this.
Two thumbs up from me
