WHAT IS IT? The sixth installment of Pro Circuit’s
four-stroke line offers the option of both an AMA Pro
sound-compliant exhaust ( 112 dB two meter max) or
Amateur-legal system ( 94 dB at 4800 rpm for a 450
WHAT’S IT COST? $999.95 (Ti/Ti/carbon end cap);
$779.95 (stainless/aluminum); $464.95 (stainless/aluminum
CONTACT? www.procircuit.com or (951) 738-8050.
WHAT STANDS OUT? Here’s a list of things that stand
out with the Pro Circuit Ti- 6 Suzuki RM-Z450 exhaust
(1) Analysis. Touted by Suzuki as an all-new motorcycle, the 2015 RM-Z450 is just an updated version of an
aging design. Showa TAC air forks and launch control
are big news for 2015, but the RM-Z450 engine is beginning to suck wind against the powerhouses in the 450
class. Although the Suzuki makes more power than the
2015 Honda CRF450, it still ranks fifth on the horsepower
chart. That is like a toddler wearing two left shoes in a
foot race with Usain Bolt. Simply put, the RM-Z450, which
lives and dies in the midrange, could stand to have more
( 2) Sound debate. Sound regulations have gotten
way out of hand. It is baffling how often the AMA
has changed their sound rules in the past decade.
Manufacturers and aftermarket exhaust-pipe companies
find ever-changing regulations, which are now 3 dB less
than last year, to be a burden. For years Pro Circuit, to
their credit, built every system they made to the AMA
Pro sound limits, while their competition didn’t. Since the
Circuit was making thousands of exhaust pipes for a
market that was only 600 racers strong. The new Ti- 6
system is still available for AMA Pro racers in the
special-edition Ti- 6 Pro Series line. For everyone else, the
Ti- 6 isn’t choked down to meet the AMA Supercross
standards. Equipped with a larger perf core and end cap,
the all-new Ti- 6 offers better throttle response and
performance from the low end to the midrange.
( 3) Options. Pro Circuit sells the Ti- 6 at $999.95 (with
Ti header, titanium muffler and carbon end cap), the T- 6 at
$779.95 (with stainless steel tubing and aluminum muffler)
and the T- 6 slip-on at $464.95 (stainless/aluminum
construction). All of the pipes, save for the Ti- 6 Pro
series, come with a removable spark arrestor.
( 4) Performance. The Pro Circuit Ti- 6 is one of the
best exhaust systems that we have ever tested on the
Suzuki RM-Z450. It does wonders to an otherwise
lackadaisical powerband by improving throttle response,
giving much-needed punch from low to mid and adding
a modicum of over-rev compared to the stock system.
Every test rider appreciated how the Pro Circuit Ti- 6
livened up the powerband. There wasn’t a single performance drawback. Installation was a breeze, as Pro
Circuit included all of the necessary hardware; we
especially liked the single-swivel pipe springs.
WHAT’S THE SQUAWK? Price. We can’t tell you what
to buy, but most MXA test riders choose the cheaper
stainless steel T- 6 because it offers the exact same
dimensions and performance as the high-price spread.
If you’re a Suzuki RM-Z450 owner and want
more power out of the lazy engine, then the
all-new Pro Circuit Ti- 6 exhaust system is the
way to go. This pipe romps.
PRO CIRCUIT TI- 6 SUZUKI RM-Z450 EXHAUST
MXA TEAM TESTED