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4-1 Street Design Kit - 4A914-1 Street Design Kit - 4G15 12v

4-1 Street Design Kit - 4B10/11/12 DOHC
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4-1 Street Design Kit - 4B10/11/12 DOHC

Price per Unit (Kit): $363.64
$275.00
You Save: $88.64
Number Kits in packaging:1
Number Kits in box:1
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Racing Performance Works Street Design Header Systems are the complete "Direct Bolt on Package" meaning no further components or parts are required. You purchase this product and simply bolt onto your vehicle, no welding or modifying is required.

The package includes the RPW 4-1 Header and Flex Pipe Assembly. The system is designed to bolt directly up to the original flange point on the stock catalytic converter.

This model is our 'Street Design" system as it utilises close to factory diameter piping to retain smooth power, torque and the ability to work with the factory ECU without throwing a CEL (Check Engine Light).

This system has been designed for low rpm and mid range torque with a modest increase in high rpm power due to the greater flowing 4-1 header design.

This is manufactured in stainless steel piping, and has made large gains from all vehicles fitted to. Whilst these are interchangeable with all 4B1 engine variations, there are difference in outlet diameters, making them model specific for maximum performance.

Manufactured to suit the following model vehicles

  1. Mitsubishi Fortis 4B10/11 DOHC Mivec 16v 2007+
  2. Mitsubishi Galant 4B10/11 DOHC Mivec 16v 2007+
  3. Mitsubishi Lancer 4B10/11 DOHC Mivec 16v 2007+

Mitsubishi ASX Fitments

These units will also fit the Mitsubishi ASX Model Vehicles (With minor modifications).

This replaces the very restrictive inherent design, improving low rpm and mid range torque. Due to the pipe diameter being nearly close to stock, there is no additional noise.


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Our websites have been moved to our new host and there are still some minor glitches but mostly worked out. Whilst we are building a new shop site, we have done some security upgrades on this older site which has improved it tremendously. Online registration is being enabled again, produce prices being updated and new products uploaded. We expect this site to be fully updated by the middle of June 2014

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