The final test configuration in this session was to replace the short header system with the full length units. The full header system is an off-road-only modification, as the collector extends to well past the location of the stock cat. The "race" header, tested with the induction ram pipe still in place, netted a small increase in peak horsepower output to 116.3 hp. More significantly effected was torque output, with the peak now edging up to 119.6 lb-ft. With the full-length header, the lower and mid-range torque filled out nicely. Compared to the stock baseline, torque at 5,000 rpm was up by 21 percent with the long header and induction tubes; power that will make itself known when you're foot is on the mat. Even the "street" system, though softer down low than the long pipes, boosted torque by about 10 percent at the bottom of our test range at 3,000 rpm, and by as much as 19 percent at 5,000 rpm. These mods will really make the Neon engine come to life.

While our dyno numbers are based upon testing the SOHC engine, tti has developed similar upgrades for the DOHC engines. Preliminary testing has shown substantial improvements are up for grabs with those engines as well.

Torque LB-FT
2-liter SOHC Neon
DynoJet Dynamometer
Tested at Brother's Performance Warehouse

RPMBaseShortIndctLong
3,000102109112116
3,500101107109113
4,000102108113118
4,500102110112118
5,00096108114116
5,50095103108109
6,00082939797

Horsepower
2-liter SOHC Neon
DynoJet Dynamometer
Tested at Brother's Performance Warehouse

RPMBaseShortIndctLong
3,00058626466
3,50067717375
4,00078828690
4,500879496101
5,00091103109110
5,50099108113115
6,00093106111111

Legend

  • Base: Stock '98 SOHC Neon, 60,000 miles
  • Short: tti "street" short-tube header; tti 2 1/2-inch exhaust system with high-flow catalyst
  • Induct: As above, with tti ram induction pipe and high flow gauze/mesh filter
  • Long: Full-length header; tti induction pipe and filter; tti 2 1/2-inch exhaust system w/o catalyst

SOURCE
TTI Exhaust Systems
Corona
CA
9-51/-371-4878
ttiexhaust.com