A week age I purchased a 77 GTB with 22k on the clock. My first F car. Second owner had it for 19 years. I have a K&N on order and am planning to drop the smog equipment, including the thermal reactor/muffler, (will store it in the unlikely event that I have to resmog it in the next two years). I have done a moderate amount of research on exhaust options and am considering the series 80 flowmaster replacement, (as did millermon and a few others). I know this is near heresy, (not using a tubi, ansa, borla or stebro), but the cost is a big factor as I have to finish paying for the car and bringing many systems a little more up to date, (wheels tires, brakes, suspension bushings, headlights, and -gasp- a non stock right side rear view muirror). I would very much like to hear from anyone who has done a similar evolution, particularly jetting suggestions for sea level. (stock: M 135, F36 tubes, 220 ac and 55 idle). Maybe go to M140-145, 200 ac, and 60 idle????? Will a change from 32 to 34 venturis be worth doing ? I am looking forward to the developement, if I can just find a place to do so. On a related note, where is the best place to acquire jets, venturis, valve adjusting tools and an assortment of shims??? I plan to drive the car frequently and quickly through the mountains and occasionally track the car. While removing the plugged up stock air filter, I noticed what looked like sound insulation inside the entry to the air cleaner. IMHO muffeling the sound of the webbers is a fairly egregious sin. Has anyone removed this stuff with good effect?? While waiting for the K&N to arrive, I took my 19 year old son out for a 7700 rpm test drive without the air cleaner and we both just about wet our pants. and NO I am not going to let him drive it Big Grins, chris.