Carmakers try their best to find an equilibrium between price, quality, performance, and safety. The end product is oftentimes satisfactory. However, it is not enough for millions of gearheads out there. Started by a handful of skilled gearheads, the modified car scene grew into a highly lucrative business. Names such as Mansory or Shelby American are well-known in the industry.

RELATED: 10 Of The Most Famous Tuners And Their Creations

A wide array of cars rolled off American assembly lines over the last 70 years. Though every car can indeed use either physical or mechanical enhancements, there comes a point when these cars should no longer be touched. Some of the most tuner-friendly cars ever built are now played out. It would be judicious to keep these cars in their original condition.

10 Mazda Miata NA

1995 Mazda Miata Cropped
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Mazda first sold its cars in the United States in 1970. Arriving in the market right at the dawn of the Malaise Era, Mazda was able to make a name for itself over the decades. In the 1980s, the Germans and the Japanese were going toe to toe to get a larger share of the domestic automobile market. Things became serious when Mazda released the Miata MX-5 in 1989.

RELATED: See How This 1,500 Mile First-Generation Mazda Miata Garage Queen Looks After A Detailing

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The Miata is among the coolest Mazda sports cars ever made. The Miata NA was so revolutionary that it forced BMW to design the Z1. The popularity of Mazda's roadster translated into huge sales numbers. As Miatas became a dime a dozen, gearheads globally started customizing them. Hoonigan even featured a Dodge Hellcat-powered Mazda Miata that can do 6th gear burnouts. Coming up with increasingly insane projects is becoming difficult. As a result, conventionally modified Miatas tend to be bland.

9 Toyota Supra MK4

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Japanese carmakers were once frowned upon. Perceived as shoddy and underpowered, they fell under the radar of gearheads looking at vehicles from established and respected brands. Those that developed an interest in Japanese cars early on may have struck gold in some cases. Piston heads globally have respect for one of the most revered Japanese cars, namely the Toyota Supra MK4.

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The Toyota Supra is an outstanding vehicle. There is no denying that. The twin-turbocharged 3.0L 2JZ-GTE V6 is a legendary engine. However, the success of the Supra ended up being a double-edged sword. Supras left and right lost their original essence. 1,000 hp demonic Supras are no longer a novelty. It is fair to assume that Supras in their original condition will fetch more cash in the future.

8 Hummer H2

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Hummer was created in 1992 after The Terminator himself lobbied for a civilian version of the Humvee. Well-known throughout the world as America's largest SUV, the Hummer is synonymous with extravagance and, of course, America. The first civilian Hummer, the H1, was an insane off-road beast. The successor, the H2, was great on a paved road.

RELATED: Here's Why The Hummer H2 is Going Up In Value

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It is well-known that the H2 would crumble off-road. Hollywood Boulevard or South Beach is where the H2 belongs. Underneath the hood sits either a 6.0L or 6.2L V8 depending on the year. However, the power delivered by the V8 combined with the size of the H2 simply is not enough to make the SUV off-road ready. The H2 would end up at every SEMA Show between 2002 and 2009, which became repetitive and numbing after a while.

7 Infiniti G35

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Anyone from Southern California will agree that Infiniti's coupes were popular back in the 2010s. In areas such as the San Gabriel Valley, it was practically impossible not to stumble across a souped-up Infiniti. Those cars looked great and were decently powered. However, the success faced by Infiniti coupes was a catch-22.

2003 Infiniti G35 Cropped
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The G35 first arrived with a 3.5L V6 capable of cranking out 260 hp and 260 lb-ft of torque. This was a decent amount of power for a $31,450 car. The G35 would eventually get picked up by every college-age gearhead. The issue is that the G35 came out at the midst of the Fast And Furious madness. Flashy paint jobs, overloads of stickers, unnecessarily loud mufflers, and other modifications undermined the reputation of the G35.

6 BMW 3-Series E46

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The 1970s were quite interesting for BMW. The Bavarian carmaker created its own performance division. The M1 would be the first car to come out from the M Division. While BMW was actively working on developing its performance division, it also made sure to design new nameplates that would eventually go down in history as some of the best German cars ever made.

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The 3-Series is one of BMW's best-selling vehicles. Launched in 1975, the 3-Series evolved to become the sedan it is today. While the 3-Series E30 and E36 were extremely popular, the E46 seems to have been the go-to BMW to poorly customize. Unlike the M3 E46, the regular 3-Series E46 looked absolutely horrible when modified by backyard tuners.

5 Ford Mustang SN-95

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Ford completely reshaped the domestic automotive industry in 1965 when it released the Mustang. It was such a major move that Chevrolet ended up releasing a competing vehicle in 1966. The rivalry between the Mustang and the Camaro is well-known among American car fans. Even if the Mustang came out victorious, Ford did not always hit the nail on the head.

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The Mustang SN-95 is one of the most awkward Mustangs ever made. Rivaled only by the Mustang II released during the '70s, the SN-95 lost the little coolness it had only a handful of years after its unveiling. Equipped with an underpowered V8 at best, the Mustang is also strangely designed. Granted it is a Mustang, amateur and professional tuners alike worked on giving it the looks and power it deserves. Very few tuners succeeded.

4 Porsche Cayenne - First-Gen

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The Jeep Cherokee and the Toyota 4Runner were inspirations. Noticing the success of those SUVs, European carmakers started looking increasingly into developing their own SUVs. Porsche was one of the last German carmakers to hop on the SUV bandwagon. The entire car scene was anxious to finally see the Cayenne, as it was the very first mass-produced SUV made by a high-end car company.

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There are several reasons why the Porsche Cayenne is awesome. One of the main reasons is the fact that it is Porsche's first SUV. Second, the base model for the first generation came stock with a 3.2L VR6 engine developing 247 hp. As the Cayenne evolved and earlier versions became more accessible, many Cayenne owners went on to turn their SUVs into clown cars.

3 Dodge Challenger SRT-8

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Dodge was always performance oriented. Back in the mid-60s, the Coronet was available with either a 426 cu in HEMI or a 440 cu in Magnum. These engines were simply phenomenal. The 426 even inspired the creation of Mopar's 1,000 hp Hellephant engine. Before paying tribute to the legendary 426, Dodge and Mopar came up with a beautifully revamped Challenger.

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Although it seems that Challengers SRT-8 are a dime a dozen, only 7,051 were made in 2008 for North America only. While customizing an R/T is all fine and dandy, turning a remarkable SRT-8 into an undrivable circus is a total waste. Several tuners successfully modified the Challenger SRT-8, but the vast majority of them simply failed.

2 Chevrolet Camaro - Fifth-Gen

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Chevrolet manufactured a variety of astonishing vehicles. From the Corvette to the Nova SS, Chevy never failed to please its fans. The Camaro, though nowhere as mind-blowing as the Corvette, is an emblem in the domestic car scene. Despite having gone through a trouble period during the '90s and early 2000s, the Camaro came back in full force in the early 2010s

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Starting at a little over $31,000, it is quite normal that the entry-level V8-powered Camaro attracted a lot of piston heads. Equipped with a 6.2L LS3 V8 rated at 426 hp and 420 lb-ft of torque, the Camaro became an instant project car. Unfortunately, the Camaro did not always receive the right treatment. Though mass-produced 1SS and 2SS may never be among the Camaros that will soon be worth a fortune, they do not deserve to be botched furthermore.

1 Nissan Skyline R34 GT-R

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When movies such as The Fast And The Furious and video games like Need For Speed: Underground came out, several Japanese cars started getting a lot of attention. Most JDM fans already knew about these cars before them being featured in the world of entertainment. The Toyota Supra MK4 is the queen of all Japanese sports cars, but there is a reason why the Nissan Skyline GT-R is nicknamed "Godzilla."

RELATED: This Is Why The R34 Nissan Skyline GT-R Now Commands Supercar Money

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The Skyline R34 GT-R is by definition a street-legal race car. Consequently, just like its predecessors, the R34 underwent an indecent amount of modifications. Some shops blatantly disregarded the fact that the R34 GT-Rs went through the roof. Moreover, the R34 GT-R is one of those Japanese cars that were featured in every car publication. It became increasingly difficult to come up with something out of this world.