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HEADER SYSTEM 2008+ WRX / STi
Our Price: £665.17
(£781.57 inc vat)
Quantity:
Reaching back to lessons learned by tuners in our past, PERRIN™ has
grabbed a dramatic power increase that was previously bottled up by the
factory manifolds. Whether normally aspirated or turbocharged, proper
exhaust gas scavenging is vastly important. The turbocharger relies on
energy from the exhaust flow to rotate its blades. By freeing up energy
that was otherwise restricted by the factory manifold we can transfer
that to the turbo to decrease spool up times and improve power. Our
R&D staff was able to manipulate the length and shape of each
runner to allow easy installation and still maintain large power
increases.
POWER
As shown in our charts section, the header makes power in all
situations. Stock STI, Legacy GT’s, and even heavily modified STIs. In
the past headers were a trade-off. Some top end power was gained where
some low end power, and boost response was lost. Also the minimal gains
made the Cost vs. HP scenario not look so hot. The equal length design
of the PERRIN header, gives you the best of both worlds. Tons of low
end power gained and still the top end power. We find a minimum of
30Ft-lbs of torque gained at lower RPM, and around 15ft-lbs everywhere
else. Same goes for Wheel HP, roughly 30WHP at lower RPM,and about
15wHP every where else. Talk about the Cost vs. HP scenario looking
good!
DESIGN
The design of the PERRIN equal length is very different from the
rest. You will not find huge oversized tubing here just to make it
look cool. You will find proper sized tubing designed for the perfect
balance of response and HP for applications beyond 400WHP. All of the
2.5L turbo engines come with an oil pan with a large cutout in the
side. This allows for a truly equal length, and free flowing header.
Many other headers collect on the passenger side of the engine, and due
to space constraints can’t be truly equal length without compromising
flow, and clearances. Because we use the added room around the oil
pan, we can create a smooth transition of the header primaries to the
collectors, and from collectors to the uppipe connection. This is why
our header makes power across the entire RPM band.
A small but important feature to our header is that it is designed to
fit to the factory uppipe. This allows for simple installation to
either an OEM uppipe, aftermarket uppipe, and our rotated turbo
kits.This is important you can upgrade any part of the system when you
choose to.
BOOST RESPONSEBecause of the design of the PERRIN equal length
header boost response is also improved. Most all cars will see about
300RPM quicker spool. This does many good things for the car. More
boost at lower RPM equals more torque, and more power. At the dragstrip
you will notice quick 60ft times, 0-60 times will be greatly decrease,
and the overall fun factor of the car is greatly improved. Check out
our charts section showing the boost response of a GT3582R.
SOUNDThe only downfall with the header is the loss of the
Subaru sound. The lumpy, thumpy sound everyone has come to love
becomes a nice smooth buttery sound, for everyone to fall in love with
all over again. Because of the unequal nature of the OEM header, the
exhaust pulses are paired together causing that lump sound. The PERRIN
header changes the note of the exhaust because of it equal length
design. The sound pulses from the exhaust are equalized and spread
out, causing the smoother, more refined sound coming from the exhaust.
Below is a test of our header on a 2005 Legacy GT. This car started asa
stage 3 LGT with the PERRIN TMIC, and uppipe installed. Only the header
was changed between runs. Check out the torque!
Below is a test a Nasioc Member did on a stage 2 STI. This car had just
an ECU flash and turbo back. Between runs only the header was changed,
no ECU retuning.
Below is a tuned PERRIN GT3582R rotated turbo kit, running
21psi.Again just the header is changed between runs. This test was
done in the very public forums on NASIOC, by Tim Gentil.
Below is the boost response change on a GT35R with only the PERRIN
header changed between runs. Another great graph provided by NASIOC
member Tim Gentil.
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