Nov 30, 2021 · The most popular options are 4-1 and 4-2-1 headers. The 4-2-1 vs 4-1 debate is quite popular for good reason — especially in the single cam community. One gives you a …

Oct 19, 2012 · A question we get a lot is: What’s the difference between 4-1 headers and 4-2-1 headers? Which header design is better and which header makes more power? It’s not that …

Sep 13, 2023 · Definition of 4-2-1 Exhaust Header. A 4-2-1 exhaust header is an aftermarket component that features four primary tubes, where two shorter tubes collect exhaust gases …

Mar 9, 2025 · 2. Tri-Y Headers (Image/Doug’s Headers) In contrast to a 4-into-1 design, Tri-Y headers are easily identified by the three Y-junctions created by first merging the four …

Oct 10, 2014 · The dotted plot is the best baseline test with the existing PLM 4-2-1 header, which netted 276whp / 199wtq. The solid plot is the final graph with the PLM 4-1 Megaphone header, …

What is a 4-2-1 exhaust system? The numbers refer to the exhaust pipe layout: Four pipes come off the cylinder head (or additional header), which turns into two pipes, and the system finally …

Nov 29, 2009 · Thanks to grumpy and vince from burnsstainless, I made the decision to build a 4-2-1 set of headers. I will use use burnsstainless 2-1 merge collectors. …

Feb 2, 2009 · 4-2-1 is more for power throughout the power band mainly focusing on the mid range. Hytech is making me a 4-2-1 for my NA set up, but said if i wanted to go supercharged, …

Jun 29, 2020 · We explain the differences, and pros & cons of both Tri-Y and 4-into-1 designs to help you pick the best exhaust headers for your ride.

Aug 5, 2002 · - 4-1 header suitable if you are looking for all out high-rpm dragging power. - Extreme performance in the higher rpm range. - Hurt your low end, but will really make up for it …