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What specific modifications and upgrades do redditors who've tuned their cars to 400hp recommend to achieve such a significant power boost?

To achieve 400 horsepower, a car's engine needs to produce approximately 3.33 horsepower per cubic inch of displacement.

A hybrid turbo can help achieve 400 horsepower on pump gas, without requiring expensive racing fuel.

The Dodge Viper, with its 400 horsepower, can accelerate from 0-60mph in just 4 seconds.

The Infiniti Q60 Red Sport, with its 400 horsepower, can go from 0-60mph in 4.5 seconds.

Tuning a car for 400 horsepower can void its warranty, so it's essential to check the manufacturer's policy before modifications.

Some cars, like the Ford Focus RS, require replacing the standard motor due to torque limitations, which can add significant cost to the modification process.

Adding more boost, cam angle, and other tweaks to a car's engine can result in gains of 30-60 horsepower, but may also reduce engine reliability.

The K20C1 engine in the Honda Civic Type R can achieve 400 horsepower with modifications, but may require additional spending of $250-$325.

The MazdaSpeed3 and MazdaSpeed6 can safely achieve 400 horsepower with the right set of bolt-on parts and tuning, but torque control is crucial.

The Ram 2500 Tradesman, with its optional 410hp 6.4-liter Hemi V8, is a workhorse that can haul heavy loads while still providing impressive acceleration.

The Audi S3 can be tuned to produce 400 horsepower with an ABT Power ECU flash, sports-style catalytic converter, and stainless steel exhaust system.

N55 engines, like those in the BMW 335i, are prone to cracking their charge pipes, even in stock form, due to heat cycling and weak factory pipes.

A well-tuned intake system can provide an additional 15-20 horsepower, depending on the car and engine.

E85 fuel can increase horsepower output due to its higher octane rating and cooling properties, but requires specific tuning and engine modifications.

The Corvette, Camaro, Mustang, M4, and C63 are all examples of cars that can achieve 400 horsepower in stock or modified forms.

Turbocharged engines can produce more horsepower per liter of displacement than naturally aspirated engines, making them popular for modification.

The science behind engine tuning involves manipulating fuel injection, ignition timing, and boost pressure to optimize power output while minimizing engine knock and pinging.

Car engines produce horsepower through a combination of torque and rotational speed, measured in revolutions per minute (RPM).

Engine displacement, measured in liters or cubic inches, directly affects horsepower output, with larger engines typically producing more power.

The term "horsepower" was coined by James Watt, a Scottish engineer, to describe the power of steam engines in terms of the number of horses required to produce equivalent work.

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