Twisted Smog Box Kit

An EGR delete kit for 1987-1997 Ford trucks and Broncos with EEC-IV ECUs :


These kits are designed for “off-road use” and will safely eliminate the SMOG, EGR, and un-needed vacuum sensors from the ECU.

Using the same approach as we take in our vintage stand-alone harnesses we are now able to do a full EGR, vacuum sensor and smog system delete kit for 1988-1997 Ford trucks and Bronco. This unit is essentially a switch that turns off the EGR and other un-needed sensor feedback to ECU. This allows the ECU and engine to operate flawlessly the way it should. In fact, it achieves better air fuel curves without the SMOG program operating. Additionally, our kit includes the belt to bypass the SMOG pump. With all of this combined you will make more horsepower, torque and allow the engine to get better gas mileage. Without our kit, if your truck has a sensor failure with any of these components, it will go into Ford’s EEC-IV “limp mode”, resulting in horrible gas mileage and a loss of power.

You can leave all of these components intact, or if you want to clean up your engine bay, you can remove them. If you need to go do emissions testing, simply remove the Twisted Smog Box and plug your system back in as normal. The other components only take about 10 minutes to swap back and go get emissions tested and be fully legal for “on-road use”. That being said, we always have passed tailpipe emissions even with the smog system eliminated.

** If you are planning on removing all of your SMOG tubing, purchase the SMOG pump tubing elimination hardware bundle option **

Included with this kit :

  • Twisted Smog EGR eliminator
  • EGR valve block off plate
  • Serpentine belt needed to not turn the SMOG pump
  • All connectors and mounting hardware
  • Shipping + Handling Included

** Attention : If you don’t need a belt, or have a specific belt brand you want to run, you can purchase the “Twisted Smog Box Kit with no belt”, or that same kit with the additional elimination hardware labeled “Twisted Smog Box Kit plus Elimination Hardware with no belt” **

5.00 out of 5 based on 8 customer ratings
(8 customer reviews)


SKU: twi-smog Category: Tags: ,

Share this product

Additional information

Twisted Smog Engine

Twisted Smog Box Kit plus Elimination Hardware with no belt, Twisted Smog Box Kit with no belt, 4.9 300, 4.9 300 w/ SMOG pump tubing elimination hardware, 5.0 302, 5.0 302 w/ SMOG pump tubing elimination hardware, 5.8 351, 5.8 351 w/ SMOG pump tubing elimination hardware, 7.5 460, 7.5 460 w/ SMOG pump tubing elimination hardware

8 reviews for Twisted Smog Box Kit

  1. 5 out of 5


    I couldn’t be any happier with the quality of product and service Russell at the 460 EFI guys offered. The throttle body swap and Twisted Smog install were smooth and have made a remarkable difference in performance and function. Along with added power and a more responsive engine, there was a large trash can full of useless, in the way, parts that were able to be removed. Highly recommended modification.

  2. 5 out of 5

    (verified owner):

    Super easy install comes with everything you need literally cut wires and hook them up and enjoy no smog engine makes it alot better.

  3. 5 out of 5

    (verified owner):

    Amazing results, tons of noticeable power. The intake manifold really let the motor get air and breath. The smog delete blockboff kit, produced tons of power not having to push that horse power robbing smog pump and exaust gas air.
    Thanks Russell for all the awesome products, and all the continued technical support with your products. Even though it is a work in progress, it is well under way to being restored.
    460 EFI guys really know how to turn the 460 into a tire ripping beast.

  4. 5 out of 5


    I installed the Twisted Smog on my 1991 F-150 and could not be happier! The instructions were easy to understand and the install was very straight forward. I have noticed improved performance and fuel economy. I am very impressed. The only downside is that I am not seeing the fuel economy increase anymore because the improved performance has turned my foot into lead. I would highly recommend this product to anyone.

  5. 5 out of 5


    my engine ran smoother than it ever has, i also noticed it picked up power and doesn’t smell like it’s dumping fuel. Thanks, from Casper Wy

  6. 5 out of 5


    Hooking up the Twisted Smog box could not have been easier. The directions are clear and straightforward. I hooked mine up and it was good from the start. No codes at all. Even if I had trouble, Russel does a great job of taking care of customers and has been a wealth of knowledge answering many questions for me. This is one of several items I bought to upgrade my 1995 F350 and I could not be happier.

  7. 5 out of 5

    (verified owner):

    Twisted smog delete box is worth every penny. No more lack of power, no more studdering, & went from 6.7 to 9.6 mpg on the 1st tank . As for the belt on a 95 f250 with ac after a few slung belts it wound up being 95.5 inch belt with 2 3/8 flat washers on all 3 alt bolts between the alt & bracket! But you can see the geometry for the idler to belt is wrong so i ordered a delete bracket & proper pully from ebay which should fix that problem & it was less than 60.00 shipped . Unlike the 99.00 bracket that you still have to buy the ac delete pully for to use the stock belt. & Russ was a big help ! Highly recommend.

  8. 5 out of 5


    I have this in my 1995 7.5l truck and it runs great! Thank you 460efiguys for helping me make my truck come to life.

Add a review