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I received the first dyno results with the new single GT TB pipe.
These of course wouldn't coincide exactly with the Bullitts' twin TB, but do offer some baseline feedback on the GT heads and with a possibly "less restrictive" factory TB pipe than the one on the Bullitt.
He gained 4.3 hp, and 5.5 ft. lbs. torque, between runs #1 and #2, with just switching the TB pipe, with the system ahead of the meter constant. He also related a 2 mpg mileage increase over the factory pipe.
He's going to scan and send the dyno runs for viewing which I'll post when I get them.

I put the iridiums in yesterday. Denso may be onto something with these. "Tip in" throttle response was noticably improved. My Mustang also had a lumpy idle which would "hunt" when it was cold which they also smoothed out.
The car was already strong and the V-POWERS I pulled looked perfect so there wasn't a "hughly noticable" gain, but I sent Lee Wilson a set so the specific dyno gains will be interesting to see. It felt like, except for the idle quality improvement, the difference when you find a filter location which dials in closer to optimum, which is usually good for around 2 hp.
 

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John...
Do you have a feel for how soon the TB Pipe will be available for the BULLITTs? I'd like to get my hands on one.
...Myron
 
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