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This is XForce's Varex valved cat back exhaust system for the GMC Sierra 1500 5.3L V8. It replaces the exhaust from the catalytic converter back with a single 3" front pipe section running into a straight through centre muffler, then twin 2.5" rear pipe work, 5" round rear resonators and 5" polished round rolled-in tips. All of the pipe work is mandrel bent and the system is built from brushed finish 304 stainless steel. It runs Varex remotely adjustable mufflers, and XForce's SmartBox control unit can be added to control them.
The sizing is worth a look. A single 3" section feeds the centre muffler, and the twin 2.5" rear pipe work behind it adds up to more cross-section across the two paths than the single 3" pipe ahead of it, so the split is not a step down in flow. Mandrel bending earns its place on a layout like this, holding the full internal diameter through every corner instead of pinching it at the bends, and a straight through centre muffler does its silencing as the gas passes along the body rather than reversing it through chambers - both consistent with the flow-focused pipe sizing. With remotely adjustable Varex mufflers, and the SmartBox control unit added, the note becomes a setting you pick as you drive: a quieter position for a long highway stint, an open one when you want to hear the 5.3L V8.
Features
- Varex remotely adjustable mufflers - set the exhaust note on demand
- Single 3" front pipe work splitting to twin 2.5" rear pipe work after the centre muffler
- Straight through centre muffler with 5" round rear resonators
- 5" polished round rolled-in tips
- All mandrel bent pipe work in brushed finish 304 stainless steel
- XForce SmartBox control unit can be added to run the Varex mufflers
Fitment
GMC Sierra 1500 5.3L V8, 2019 to current, and the Chevrolet Silverado 1500 5.3L V8. Suits the regular cab model with the 70" bed.
Does not fit: Regular cab with the 70" bed only - other cab and bed combinations are not covered.
Please note: A valved exhaust is loud with the valve open. Check your local noise regulations before using it that way on the road.
Let customers speak for us
Solid shipping ,good communication ,great product 5stars all the way
First let's preface I have tried three other tuners. Not bad mounting or name dropping as they all were solid tunes. But Daniel just has that magic touch when tuning the 1.6 platform.
The car has a buttery smooth power band making the car feel like a larger displacement six cylinder over a turbo charged car. Plenty of fun to be had at any speed or RPM range.
He will take the time to get you dialed in perfectly for your car. No canned tunes here folks. And if you are a EK1 user three tunes for the price of one simply can't be neat.
I received the Stage 2 tune. Here are my thoughts:
- The shifts are buttery smooth
- I love the auto shift @2000rpm when cruising around town; saves me an extra 2-3mpg overall
- Driving in traffic is a dream now, much better than stock. I don't even hear that annoying shifting fork anymore, lol
- Any and all DCT slips are gone
- The increase in torque limit! This opened up my N75 Stage 3 ECU tune; I can feel the difference. The last time I dynoed, I got 289 lb-ft of torque. But it feels much more substantial than that!
- The clamping force is unreal. I did a run from a dig, and it hooked and slammed through the gears all the way to 7k rpm in each gear. Amazing.
Conclusion: This TCU tune is a must-have. If you have an N75 ECU tune, it is an absolute game-changer! Especially with the Redline MT-LV fluid that I'm running. I can't wait to get my retune with water meth injection. Daniel and the rest of the N75 team are the best!
Works like suppose to be fast delivery after installation 5 minutes drive TPMS sensors lights off everything is normal like from factory 👍👍👍
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Product was very easy to install and what a difference in shifting also n75 was super awesome to deal with will shop here again
After using the N75 tune for a couple of months, I can confidently say that it offers the best value for your money on the market. I've tried SXTH and LAP3 tunes before, but since switching to N75, I won't look back. With top-notch customer support, it ensures your car performs better, turning heads at every car meet.
Been running stage 2 off that bat and had some problems here and their regarding fueling. Daniel has been with me the whole way, answering questions and adjusting tunes while adding revisions whenever asked. He answers every question I ask even when they don’t relate to tuning.
Highly highly recommend N75!
Daniel's tuning and customer service makes this product a 10 out of 10. I'm new to tuning and he made the process a breeze. I literally laughed out loud when I first drove the car after installing the stage 2 tune. I still can't believe the difference.
Love the intake, fitment is superb, instal was easy and best of all n75’s customer support is stellar and way above average!
M45IL Kia Stinger GT 3.3TT Spark Plugs
Hands down best bov I’ve had, I got the part 5207 for trumpet sound and man. You won’t be disappointed. Shipping was fast & easy.
Looks great!
Fast shipping, easy to install, quality built.
Waiting for some more parts then dyno time!
Awesome
Perfect size and great location for the WMI port.
