What is a 4-2-1 exhaust system?

A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine.

Are Tri-Y headers worth it?

Tri-Y style headers do a good job maintaining flow velocity. Exhaust from one tube rushing past the “Y” can help scavenge air from the other tube. Tri-Y headers often make better low-end torque than similar 4-1 headers.

What is a tri-Y header?

Invented by Doug Thorley Headers, the Tri-Y header is designed to match the synchronization of the engine firing order, thereby maximizing exhaust scavenging. This design creates the optimum torque and greatest horsepower gains in comparison to any other design.

What are tuned headers?

A tuned exhaust header’s primary-tube length has a direct influence on engine performance. It controls where in the engine’s speed range the header will add performance. Longer tube lengths pull the torque down to a lower speed. Shorter lengths move the powerband up into a higher speed range.

What are Tri-Y headers?

How do exhaust headers improve performance?

Headers are one of the easiest bolt-on accessories you can use to improve an engine’s performance. The goal of headers is to make it easier for the engine to push exhaust gases out of the cylinders.

Are quad tips louder?

For the most part, the answer is no. The primary reason drivers install a set of exhaust tips is for the enhanced appearance the tips provide—not to make their vehicle louder. The primary reason drivers install a set of exhaust tips is for the enhanced appearance the tips provide.

How much hp can headers add?

The aftermarket exhaust header added about 4 hp on its own and broadened the car’s power curve. So, it didn’t add much power, but it added it across the board.

What is the difference between 4-1 and 4-2-1 headers?

The 4-1 headers usually have less back-pressure than the 4-2-1 header and customers have stated their cars seem louder at high RPM with the 4-1 headers. Most headers that are street legal or CARB legal are usually of the 4-2-1 design but there are exceptions.

What is the difference between 4-into-1 and try-Y headers?

“Conventional 4-into-1 headers collect the exhaust for one side of the engine into a single collector. Despite their simplicity, we have found no advantage in using any more complex header design for most race cars.” Try-Y (4-2-1) headers collect the exhaust by pairs of cylinders that are as far apart as possible in the firing order.

How do 4 pipe headers work?

As the name implies, the headers start from 4 pipes that merge into 2 pipes and those merge into 1 pipe. You can see from the headers on the right how this design plays out. For most cars, this design produces more mid range power with the sacrifice of top end power.

What are the different types of exhaust headers?

Aside from 180-degree headers (which are unquestionably a nightmare to build for any car and well beyond our scope here), there are two different types of headers: 4-into-1 and “Try-Y” (4-2-1-collector). “Conventional 4-into-1 headers collect the exhaust for one side of the engine into a single collector.