Dodge Neon Sport

Dodge Neon Sport

Dodge Neon Sport

People may think the 4 inch piping on their Dodge Neon is pretty good, but they will almost certainly be losing power because the pipes are too big, and it’s all to do with air. Cool air is dense while hot air is less dense and so will flow better. Ideally the exhaust gas should to be as hot as possible to ensure it flows quickly, but if it is fed it into too large a pipe it expands and cools down, becomes more dense, and therefore it's harder to push the gas through the exhaust system.

Choosing the right exhaust piping

But at the same time if the pipes are too narrow the gas jams up in the pipes and can't get out quickly enough. As a rule of thumb 250 to 350hp engines should be using 3 inch to 3 1/2 inch while 400hp and more should be using four inch systems. Another concern is ensuring the piping will fit under the car without slamming into the ground every time the car goes over a bump.

And while Mandrel bent piping - which remains circular through the bend - is obviously better than compressed bends in the pipes, it doesn't make that huge a difference in power and mandrel bending is more expensive.