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

Fari Anteriori BMW E92 / E93 07-10 Nero Xenon

Replacing the stock ball joint with this product will result in reduced roll

Sonar Headlights Angel Eyes Black Housing Honda Prelude

Intercooler Audi A4 2.0 TFSI B7 Arancione Alettoni - Spoiler The 4-1 headers usually haveAftermarket intercooler kit dedicated to Audi A4 2. 0 TFSI B7. Complete intercooler kit includes high performance FMIC. EU intercooler with our new type of alternately arranged core, set of silicone connectors and elbows, set of aluminum connectors and clamps. Depending on how you install the intercooler to the frame of the car some elbows may need to be shortened. FMIC. EU performance intercoolers are made from high quality aluminum alloy, and