B-Series B16 B18 B20 2.5 Collector Stainless Steel Exhaust Manifold 4-1 for Honda Civic Acura Integra

$499.00 USD $349.95 USD

Before You Order

Confirm fitment, lead time, and install details before checkout.

Fitment Support In Stock / Made To Order Returns Check
Fitment Check Confirm year, make, model, trim, bumper style, wiring, and selected options before checkout.
Build Details Photos, vehicle search, and recommendations are helpful guides; final fitment can vary by build.
Lead Time In-stock items move fastest. Made-to-order specialty parts may need extra preparation before tracking updates.
Inspect First Inspect every part before painting, drilling, cutting, modifying, or installing it.
Not sure it fits? Send your vehicle details and product link to support@vektomotorsports.com. Ask Support

COMPLETE YOUR SETUP

RMF Version 2 header features a true 4-1 merge collector, with a megaphone to create equal exhaust flow & delivers the best peak horsepower gains while utilizing a 1-piece design. 

  • 304 brushed stainless steel
  • True 2.5 inch collector
  • Megaphone with reverse cone
  • Hand TIG welded
  • A/C and P/S compatible (slim fans required)
  • CNC machined manifold flange
  • One year warranty
  • 18 gauge, 304 stainless steel
  • Includes OEM spec header gasket 
  • Includes OEM spec donut gasket 
  • One piece design
  • Includes skid plate
  • Half core radiator must be used
  • Recommended for 1.8L-2.0L engine displacements

Fits all B-Series motor in 94-01 Acura Integra, 99-00 Honda Civic Si DOHC, and Delsol with the DOHC motor except B20 CR-V block unless you have a different oil pan.  *This is a 2.5" Collector, you will need a 2.5" inlet exhaust or a High Flow Cat that accepts this 2.5" Manifold.   

Description
RMF Version 2 header features a true 4-1 merge collector, with a megaphone to create equal exhaust flow & delivers the best peak horsepower gains while utilizing a 1-piece design. 

  • 304 brushed stainless steel
  • True 2.5 inch collector
  • Megaphone with reverse cone
  • Hand TIG welded
  • A/C and P/S compatible (slim fans required)
  • CNC machined manifold flange
  • One year warranty
  • 18 gauge, 304 stainless steel
  • Includes OEM spec header gasket 
  • Includes OEM spec donut gasket 
  • One piece design
  • Includes skid plate
  • Half core radiator must be used
  • Recommended for 1.8L-2.0L engine displacements

Fits all B-Series motor in 94-01 Acura Integra, 99-00 Honda Civic Si DOHC, and Delsol with the DOHC motor except B20 CR-V block unless you have a different oil pan.  *This is a 2.5" Collector, you will need a 2.5" inlet exhaust or a High Flow Cat that accepts this 2.5" Manifold.   

Fitment & Install Notes

Fitment first: Confirm your vehicle year, make, model, trim, bumper style, wiring, and product options before checkout. Product photos, vehicle search, and recommendations are helpful guides, but final fitment can depend on trim, modifications, and install setup.

  • Installation: Professional installation is recommended for lighting, exhaust, carbon fiber, steering wheel, brake, and body components.
  • Lead time: In-stock items move fastest. Made-to-order specialty parts may need extra preparation before tracking updates.
  • Before install: Inspect all parts before painting, drilling, cutting, modifying, or installing. Contact us first if anything looks incorrect.
  • Need help? Email support@vektomotorsports.com before purchase if you want fitment support for your build.