Project Snow White (10th Gen Si) Part 2 Cobra Intake

Project Snow White (10th Gen Si) Part 2 Cobra Intake

Ask and you shall receive! Data, dyno numbers and sound clips from our Cobra Cold Air Intake system is finally here! We will be offer Si and Non-Si specific systems!

2017 Honda Civic Si w/ Stock ECU Mapping (Not Tuned Whatsoever)

  • PRL Motorsports Catted Downpipe / Front - Pipe Combo
  • PRL Motorsports Prototype Intercooler
  • PRL Motorsports Prototype Cobra Cold Air Intake System (Street MAF Housing)

What's important to note here is that these numbers are in comparison to our previous dyno session where the car had the same exact modifications except with our Stage 1 intake system instead of our cold air so we didn't have to put everything back to stock.

We made sure all conditions were identical for testing (i.e. 55% knock control value, ~180 degree coolant temps, similar ambient temps, etc.) and this is what we came up with.

~5 horsepower and torque gains throughout almost the entire powerband in comparison to our Stage 1 intake system. This means 9 - 14 horsepower and torque gains throughout the entire powerband over the factory intake. No these aren't crazy marketing ploy gains, these are honest, tried and true gains that every person can expect to see by simply installing this intake system on his or her 1.5L Turbo Civic without a tune. It's important to note that the car was making 1-2 less pounds of boost throughout the midrange, hence why torque gains were minimal down low during peak torque. These cars are very sensitive with knock control and how it controls timing/boost.

We found the MAF curve to be extremely stable, identical in response to the factory intake. This will be our first cold air intake system ever to not require any tuning whatsoever. Customers can expect greater gains once the boost is turned up and components are pushed to their max. Once we find the limit of the Street MAF we will test our Race MAF


Here is a comparing our 10th Gen Si when it was stock to everything that has been modified now. Very impressive results for no tuning whatsoever! Next comes the fun part... Tuning with @KTuner!

Also, we finally got around to installing our D2 lowering springs!

Excuse the cellphone quality here, but incase anybody missed, we managed to squeeze out 280 whp and 335+ ft/lbs tq out of our shop car the other day! That's 100 hp in gains and well over 100 ft/lbs tq gains over stock with only a few simply bolt-ons and tuning on e25/e30 fuel blend! 100 whp in a car that comes with only 180 whp is a night-and-day difference!


  • PRL Catless DP/FP
  • PRL CAI System
  • PRL FMIC Kit
  • Clutch Masters FX400 6-Puck, Rigid Disc Clutch
  • @KTuner V2
  • Custom Tuning via @VitViper and Denis Howell at PRL Motorsports

We dumped that cat-back exhaust from the front pipe in the video to see if there were any gains over running a full stock exhaust... To our amazement, there was not! This car pumped out repetitive back-to-back 280/279whp pulls with and without the factory exhaust. The factory exhaust system has showed to flow extremely well for this little 1.5L turbo and tiny turbine so far. With that being said, power gains from going cat-back exhaust will not be notable whatsoever on sub-300whp setups for this platform.

We switched from our catted downpipe to a catless and picked up roughly a 5-7 hp gain. The knock control value actually dropped down to only 49%, which helped us free up some nice power. To simplify, 49% knock control value means that our parts, including our catted downpipe, helped this car pick up more efficiency than we have ever seen before!

To reiterate, this car has nothing special done to it and this isn't a marketing ploy. Any 1.5T 6MT Civic customer can expect to see identical gains by doing $2,500 - $3,000 in mods.

We decided to take our 2017 Civic Si to the track and see what it could do.

First hit was 13.3 at 108 MPH and a 2.1 60ft.

Our best run of the night was a 13.1435 at 108.77 MPH with a 2.0 60ft on stock all season tires. This car should break into the 12s with ease when we get some slicks on it!

The car is currently making 280 whp and 330+ tq on e30. Mods: PRL catless downpipe and front pipe combo PRL CAI PRL FMIC KTuner ClutchMasters FX400 clutch D2 Springs Tuned by Denis Howell at PRL Motorsports and VitViper at Vit Tuned Stock exhaust, stock turbo, stock engine.

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