Exhaust System Selection
Ultima
®
engines can be very exhaust-system sensitive and proper selection of exhaust system will yield the highest power levels. Ultima
®
horsepower and torque tests were done with Hooker Step Tuned drag pipes and Hooker 2 into 1 systems. When selecting exhaust systems
avoid large diameter pipes that do not have a smaller primary pipe that exits the head for at least 4-8” and
avoid installing torque cones
as
these were made for small cubic inch engines (80ci-96ci). Overall the owner’s satisfaction of the selected pipe is most important but it can
also have a negative effect on rated power levels. For peak power levels a good stepped exhaust (1-3/4” Primary 4”-8” long to 2” pipe 12”-
16” long to 2-1/4” pipe for the balance) drag pipe 32”-38” long will yield the highest numbers. For all around rideability select a free flowing
staggered dual muffler set or the 2 into 1 systems. There are many exhaust systems out there with just as many opinions on what works.
Contact your exhaust manufacturer for suggestions on which exhaust system would best work for your size engine.
Starter and Battery Considerations
Ultima
®
80 thru 113 CI configurations will typically have no starting problems when using components with comparable power ratings as
used on OEM motorcycles built after 1989. Ultima
®
starters, batteries & battery cables are recommended when upgrading from the stock
components. Typically an Ultima Thunderfire
®
starter with a 1.4 to 1.75kw rating when used with an Ultima
®
AGM battery & high quality
Ultima
®
cables will give the best performance on our 80 thru 113CI engines. An Ultima Thunderfire
®
starter with a 2.0 to 2.4kw rating when
used with an Ultima
®
AGM battery & high quality Ultima
®
cables will give the best performance on our 120, 127, 130 & 140CI engines.
13
ULTIMA
®
THUNDERVOLT AGM
HIGH POWER BATTERIES
ULTIMA
®
PREMIUM
BATTERY CABLES
ULTIMA
®
THUNDERFIRE
HIGH OUTPUT STARTERS
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