Neuspeed has two intake systems. Its P-Flow is good for a 5-7whp and retails for $200. If you combine it with Neuspeed's $300 ECU upgrade, you will still be CARB legal. Neuspeed's $240 Racing Series CAI places the filter ahead of the inner fender for the coldest possible air. But, it's not recommended for wet areas. Their power pulleys are billet aluminum, anodized and work with the factory belts. They replace the crank, alternator and power steering pulleys to unleash 4-6whp from 5000-6200rpm. The firm also carries its own German-made, chill-cast billet 256 cam with 10.8mm lift, which it claims to be the most aggressive profile without setting off a CEL. Up to 10whp gains are available. Neuspeed's billet cam gear retails at $160 and offers up to 7 of adjustment. The company's exhaust systems are available with either 60mm (2.36") or 70mm (2.75") piping, retailing at $700 and $800, respectively. They feature mandrel bends, TIG welding and stainless steel construction, manufactured to ISO-9000 standards. They fit cars with or without factory bumper cut-outs.
EIP Tuning has an ECU conversion for $300 but you must send them your ECU. They report a stock 2.0 would see 110whp, with an extra 11 lb/ft. A $350 Schrick cam is offered with 11mm of lift, plus 260 and 276 duration for the intake and exhaust, respectively. EIP also offers built heads. Its standard ported head costs $800 using OEM heat-treated castings and is flowbench tested, fitted with tapered guides and it even includes a multi-angle radius valve job. Their $999 Big Valve head is for boosted applications and includes high-pressure springs, 42mm intake valves with a 7mm stem, and stock-sized exhaust valves. In both cases, a $500 core deposit is required. Furthermore, EIP has two mandrel-bent, stainless steel exhausts. Its Street series is a 2.5" slip-style unit that retails for $640. The Competition series retails at $700 and uses a three-bolt flange that works with its Competition series high-flow cat for $250 extra. In both cases, a 4" tip is included but a center resonator is an extra $100.
Techtonics Tuning has a 2.25" stainless exhaust for $570 that's good for 7whp in the mid-range and should give you up to 105whp. An aluminized version using a Flowmaster or Borla muffler is also available for $325-405, providing the same gains. For '01-05 cars, you can add TT's 2.25" stainless downpipe with a $410, 400-cell cat, bringing your stock 2.0 to around 108whp. The 260 TT camshaft retails for $130 and is reportedly good for 4-5whp. Its 266 cam works with a dual valve spring upgrade ($110) and will net you a couple more hp, but may also trigger a CEL. If the head is properly ported, TT's 41mm intake and 34mm exhaust valves (39.5mm and 33mm stock) can provide a 28% flow gain for around 9-11whp. For an extra $216 you can get larger valve seats and use TT's 42mm intake and 35mm exhaust valves that sell for $200. This should bump gains to roughly 12-15whp. Add TT's tapered guides for $56 and flow further increases by 2%.
Unorthodox Racing is synonymous with pulleys. Its billet aluminum set under drives the crank, while the accessory pulleys are lighter but retain stock diameter so don't affect functionality. Expect a handful of hp.
As a race team selling proven products, Usually Sideways Rally Team (USRT) provides a few neat products. Its short runner intake manifold works with the stock vacuum, brake booster, IAT sensor, etc and gives up to 12% gains on mildly modified engines. In fact, although your stock car should see 105whp at 5500rpm, the gain at 6200rpm is an impressive 15whp over stock (from 82 to 97whp). This reduces the downward slope of the torque curve, flattening the hp curve so you can stay in gear longer at wide-open throttle. USRT reports the manifold is currently discontinued while a new one with better flow is in the works. However, they also sell Snow Performance distilled water/alcohol injection systems for N/A or boosted engines to suppress detonation. This allows you to run more ignition and leaner air-fuel mixtures without increasing octane. The kits start at $389 for their stage 2 load-based controller kits. You can also contact USRT for power-specific fuel system products. So if you're planning to build a 2.0 capable of 300whp, USRT has 580cc injectors, a billet fuel rail and 255 lph fuel pump for $499.
$1000-2000:
Supersprint offers its own straight-through engine-back exhaust system. The $1110 header features nice mandrel bends and port-matched flanges. It attaches to Supersprint's $256 center resonator, which then bolts to the $582 cat-back system. Your total is $1948.
$2000-3000:
EIP's $2899 stage 1 turbocharger kit gives 5-8psi. It includes a Turbonetics T3 turbo, Tial wastegate, exhaust manifold, stainless downpipe, intake, E-PROM, blow-off valve, fuel pressure regulator and all necessary piping and connectors.
As one of the more affordable forced induction packages available, Kinetic Motorsport prices its stage 1 kit at $2750. The package includes a T3/T4 turbo, which mounts to a cast exhaust manifold. The turbine-side of the turbo is a 48R, with a GT30R cartridge, while the compression side uses a Mitsubishi housing with a 3" inlet and 2" outlet. A set of 42 lb/hr injectors are employed to increase fuel flow, while C2 software completes the package. As such, the kit should produce a reliable 150-160whp.
Neuspeed's twin-screw supercharger kit uses an Eaton blower, which along with its P-Chip is CARB-approved up to '02 models. With a stock exhaust, up to 150whp at 6200rpm is available from this $2500 bolt-on kit.