x and h pipes

About 2 1/2 years ago I decided to try TTI's 3" X-pipe and Ultraflo mufflers with their 1 5/8"-1 3/4" stepped headers that I had been running open for years. It ends at the rear housing with the mufflers. I decided on X instead of H because just about everything I've read said that X would make more power. Also, just looking at it from an airflow perspective, it would appear to be a better, smoother flowing set-up that could actually help scavanging. No 90* angles! That's kind of how a vac-u-pan system works with the header mounted pipe inserted at a 45* angle inside the collector.

While I didn't make any back-to-back comparisons to eliminate track and weather variables, every indication from past record keeping showed that the system helped my combination. It also helped when I removed the 60 lbs the system added from other parts of the car and did additional carb tuning. I figure at least .05 or perhaps .10. I was sure enough that I decided to keep it on despite having to take weight out elsewhere to get back down to class minimum weight and the extra trouble of having to drop the system when having to replace the trans.

I can actually hear my Holley blue pump at idle and I've gotten lots of compliments from other open header racers.

I ran a best of 11.312 @ 115.03 mph last June in Budds Creek, MD when I "turned it up" for a heads-up race which I won. 1.486 60" time at 3,540 lbs.