Magnaflow offers a full mandrel bent stainless steel cat-back exhaust. The dual muffler system is designed using a combination of 2.25- and 2.5-inch piping with an integrated H-pipe. The rear muffler section features four three-inch polished tips. On a totally stock vehicle, this system produces a claimed 10 more horses with an additional 15 lb-ft of torque. $1,378
Reducing weight is always a good thing. With this in mind, Cross manufactures what could be the ultimate cat-back M3 exhaust from ultra-lightweight titanium. $5,400
If forced induction is not an option, installing a set of Schrick camshafts (distributed by Turner Motorsport) is a good way to optimize bolt-on modifications like intakes, headers and exhausts. The 264-degree intake and 246-degree exhaust cams provide mid-range and top-end gains without sacrificing low-end torque or requiring special software. $1,280
Dinan has drawn on its lengthy experience in BMW performance tuning to develop the S3-R intercooled supercharger system, probably the ultimate E46 M3 power upgrade. The system can be installed and serviced through 150 authorized BMW dealers and includes a four-year, 50,000-mile warranty. This system produces 462 hp and 328 lb-ft torque. $19,999
*BMW 335i (E90, 2007)
BMW's new in-line six-cylinder gasoline engine with twin turbos and High Precision Injection is just begging to be tweaked. Evotech's recalibration of the vehicle's engine management system bumps up power from the stock 300 hp to a claimed 375. $1,295
Additionally, Agency Power offers a 321 stainless steel cat-back exhaust system for this car. The stock 2.25-inch piping and mufflers are removed from the catalytic converter back, then replaced with 2.5-inch mandrel bent piping with a single canister muffler ending in dual 3.5-inch tips. $1,200
*BMW 540i (E39, 1996-2003)
Supersprint makes headers to fit the standard 540i and M5. Each is uniquely designed using four individual mandrel bent primary tubes that end in one collector per side. On the M5, the system adds approximately 30 wheel-hp. $4,742
VF Engineering offers a stage one supercharger kit that uses a Vortech V2 `Super Quiet' blower producing 6 psi of boost. Stock numbers of 280 hp and 310 lb-ft of torque can be augmented to a claimed 415 hp and 395 lb-ft. $6,000
VFE's stage two system is currently in development and is expected to up output to an estimated 475 to 500 hp. This is done by replacing the stock intake manifold with a cast aluminum unit integrating an air-to-liquid intercooler. Price to be determined.
*BMW M5/M6 (E60/E63, 2006-07)
Supersprint headers, distributed by Turner Motorsport, incorporate CNC-cut flanges to ensure accurate fit and seal. Primaries are designed so each is as close to equal length as possible. These headers, coupled with a pair of 200-cell metallic catalytic converters, can produce claimed gains of up to 60 hp. $11,554
*Ferrari 360 Modena
Novitec Rosso (distributed by CEC) offers a bi-compressor supercharger system. The kit includes a pair of superchargers, heat insulated modified intake tract, water-cooled intercoolers with additional water coolers, reinforced V-ripped belts with dynamic tensioners, larger injectors, a modified ECU working with a pair of Novitec-tectronic units and a carbon air filter-housing. A pair of exhaust manifolds, a high-flow cat, and a sport exhaust is also included. It's not cheap, but this upgrade will bump power up to a claimed 560 hp and 415 lb-ft, good for a zero to 60 mph time of 3.8 seconds. $62,297
*Ferrari F430
Novitec Rosso has three upgrade options. The first recalibrates engine management and increases the rev limiter to 8850 from the stock 8500 rpm, resulting in a claimed 19-hp peak gain. $5,479
The second adds a carbon fiber airbox with a high-flow air filter, increasing overall horsepower to a claimed 513 and torque to 351 lb-ft. $9,990
Finally, the Novitec's twin compressor conversion is now available. With the supercharger kit installed, engine output is increased to a claimed 636 hp and 465 lb-ft of torque, which should post 3.7-second zero-to-60 passes and a top speed of 216 mph. $65,899
*Ferrari 612 Scaglietti
Novitec Rosso offers a power upgrade through modified engine software as well as stainless steel exhaust system without the OE flap regulation. Output is increased to a reported 555 hp at 7250 rpm and 442 lb-ft of torque at 5300 rpm. $9,500
*Jaguar 4.2L supercharged engine
Jaguar XP manufactures an affordable supercharger pulley upgrade. By swapping out the stock item, the vehicle will see a boost increase of 1.5 psi to deliver an extra 13 to 15 hp at the wheels. $525