2008 Scion TC
Pros
Powered by a 2.4L VVT-i (Variable Valve Timing with intelligence), the Scion tC produces 161 hp and 162 lb-ft of torque. Since its introduction in '04, the tC has remained loyal to the 2AZ-FE engine, thereby creating a plethora of competitively priced bolt-on parts from many popular aftermarket manufactures.
Cons
Although a popular model in the re-styling scene, the tC has yet to be taken seriously amongst hardcore tuners. This is apparent when seeking essential, yet inconspicuous performance modifications such as engine management solutions. However, the recent success of Tanner Foust's tC Formula D sled and Chris Rado's time-attack machine has many enthusiasts rethinking their perception of the tC as not only a show-worthy vehicle, but a contender on the track.
Notes
Differences in both appearance and nomenclature between the tC and its boxy brethren (the xA xB, xD), are not accidental. The Scion shares the same chassis as the Euro-spec Toyota Avensis, giving the tC a lower center of gravity, lighter weight and a more ridged chassis verses the '09 xB, arguably making the tC the most performance-minded platform within the Scion family.
Magnaflow Exhasut
Pros
Magnaflow's cat-back exhaust system utilizes mandrel-bend, 100-percent stainless construction, and comes with a lifetime warranty. Upon installation and starting the car for the first time, we were impressed with the deep and crisp tone that emanated from the tailpipe at a healthy, yet socially acceptable, decibel level. We savored the fact that the Magnaflow exhaust is one the few true, cat-back systems on the market, as most manufactures offer only an axle-back system for the tC.
Cons
The configuration of the Scion exhaust utilizes two catalytic converters, one of which is welded into the factory B-piping, located between the tC's stock header and the axle-back section. Thus, installing the Magnaflow unit required cutting the stock exhaust after the catalyst in the B-pipe, and slip joining the Magnaflow unit onto it.
Parts
Inlet pipe, intermediate pipe, muffler, tailpipe, clamps,
Tools
10mm, 12mm, 14mm and 17mm sockets, 14mm open-end wrenches, ratchet, extension, exhaust hanger removal tool, PB Blaster, metal cutting device
Installation Time
30 minutes
Notes
Installation was fairly quick and easy, with the only difficulties resulting from cutting the factory exhaust directly after the second catalytic converter. If cutting your stock exhaust is too much to bear, consider fabricating an extension pipe between the Magnaflow inlet and the stock header, which would conveniently remove the catalytic converter and eliminate the need to permanently alter the OEM exhaust.
Magnaflow
Cat-Back
Performance
Exhaust
Horsepower Gain
• 2,000 to 3,500 rpm range: 2.0 to 3.0
• 3,500 to 5,500 rpm range: 3.0 to 5.0
• 5,500 to redline rpm range: 6.0 to 7.0
Torque Gain
• 2,000 to 3,500 rpm range: 4.0 to 5.0
• 3,500 to 5,500 rpm range: 2.0 to 6.0
• 5,500 to redline rpm range: 3.0 to 7.0
K&N Typhoon Air
Intake System
Horsepower Gain
• 2,000 to 3,500 rpm range: 1.0 to 3.0
• 3,500 to 5,500 rpm range: 3.0 to 6.0
• 5,500 to redline rpm range: 8.0 to 9.0
Torque Gain
• 2,500 to 3,500 rpm range: 3.0 to 5.0
• 3,500 to 5,500 rpm range: 4.0 to 6.0
• 5,500 to redline rpm range: 8.0 to 9.0
K&N Intake System
Pros
Installing the K&N intake system proved to be an effortless task, thanks to the detailed instructions and precise fitment provided with the kit. The R&D that went into designing the intake was apparent, as we encountered no idle issues or troubling engine codes upon install. However, even more impressive than the quality of the product were the consistent power and torque gains the intake delivered.
Cons
If cleaning the K&N filter at a recommended 50,000 miles is a hassle, modifying a car just isn't for you.
Parts
Intake pipe, filter, couplers, tubing, clamps, heat shield, brackets, all necessary hardware
Tools
Phillips screwdriver, ratchet, extension, 10mm and 17mm sockets, 10mm open-end wrenches, 3mm Allen wrench, pliers
Installation Time
30 minutes
Notes
None. Follow directions when installing and enjoy more power, torque, and-we suspect-better fuel economy. If it ever fails, send it back. It's that simple.
Weapon-R Headers
Pros
The Weapon-r 4-2-1 long-tube header is constructed of stainless steel and is CNC welded, making for a performing, high-quality piece. Steady gains after 4,000 rpm are particularly sweet up top. Included with the headers is a free check-engine light (CEL) eliminator.
Cons
Because of the tC's front-facing exhaust ports, positioning the header in its proper place became an exercise in anger management. After several attempts trying from above and below the engine bay, we found it necessary to remove the cooling fan and disconnect wires. Once we cleared out some of the necessary clutter, the header was able to easily slide into position. We did observe some minor power loss around 3,800 rpm, but this is to be expected and is worth gains at the higher revs. Also note that the header eliminates one of the catalytic converters, and may not be legal for road use in your area.
Parts
Stainless steel header and CEL eliminator
Tools
10mm and 12mm sockets, ratchet, extension, 10mm open-end wrench
Install Time
90 minutes
Notes
The dip in torque around 3,800 rpm and the gains above 4,000 rpm are due in part to how pressure waves travel down the length of the header. These waves are directly influenced by tubing diameter and the overall design of the header, allowing for engineers to alter the power band. Like most things automotive, compromises must be made in header design. With this particular header we saw a small dip in torque on the low end, but made up for its loss in horsepower at higher rpm.