High Volume Downpipe Upgrade Introduced for All Existing Platforms!

Spencer Melillo
2 comments
High Volume Downpipe Upgrade Introduced for All Existing Platforms!

A few weeks back we announced our direct partnership with G-Sport Emissions Systems Powered by GESi for the 11th Gen Honda Civic 1.5L Turbo. Today we are excited to announce the introduction of GESi's 400 CPSI catalytic converters into the rest of our existing platforms with the High Volume Downpipe Upgrade! We have been working behind the scenes for many, many months, in an effort to change the downpipe game for the Honda community.

What is CPSI?

  • CPSI, or Cells Per Square Inch, are used to measure how much catalyst material is used in a catalyst substrate. The lower the CPSI rating, the less restrictive the catalytic converter. For example, a catless downpipe would have a 0 CPSI rating. However, a lower CPSI rating also means a catalyst with low effectiveness. A higher CPSI means a more effective catalyst. A 200 CPSI cat will have holes 2x the size of a 400 CPSI cat.

What are the benefits of this GESi/G-Sport catalytic converter?

  • 1.5L Turbo Folks - All of our PRL Motorsports downpipe assemblies for the Honda 1.5L Turbo will utilize a 4.50” OD 400 CPSI (500-850 HP calculated by GESi/G-Sport) catalyst body, in comparison to our previously used 4.00” OD 300 CPSI (350-500 HP rated) catalyst body. Using to A=πr2 calculate the cross sectional area of the catalyst body, we can see that a 4.00” diameter cat has a cross sectional area of 12.57 sqin and a 4.50” diameter cat has an area of 15.90 sqin, which is a 27% increase.
  • 2.0L Turbo Folks - All of our PRL Motorsports downpipe assemblies for the Honda 2.0L Turbo will utilize a 5.00” OD 400 CPSI (850-1000 HP calculated by GESi/G-Sport) catalyst body, in comparison to our previously used 4.00” OD 300 CPSI (350-500 HP rated) catalyst body. Using to A=πr2 calculate the cross sectional area of the catalyst body, we can see that a 4.00” diameter cat has a cross sectional area of 15.90 sqin and a 5.00” diameter cat has an area of 19.63 sqin, which is a 56% increase.
  • Our new assemblies will be the highest flowing, least restrictive downpipes on the market that will not require any type of ECU calibration or tuner for installation. Because of this increased flow, we will be marketing these downpipes as “High Volume”
  • (Soon to be) EPA Approved (currently undergoing testing)
  • Top-grade materials, such as a brand new catalyst coating engineered specifically for Direct Injection applications

Pre-orders are now live with an expected fulfillment date of December 15th, 2021

2 comments

Bob Melchert

Bob Melchert

Just wondering if there is less, or eliminated, chance of CEL catalyst deficiency issues with this compared to other DPs on the market? I am hesitant to change the DP on my 2020 Si coupe since I really don’t want to deal with the likely P0420 that will just make it annoying for me to pass IL emissions.

Thus far I have your Race MAF CAI along with 27Won’s FMIC & TIP running the race tune from Phearable.net No weird quirks, hiccups, funny noises and no CEL’s.

Further modification plans only include front pipe and the rest of the exhaust out the back; turbo will stay stock. I’m fine keeping the OE DP if that is my best chance of no CEL, but the fact you said yours would be EPA compliant really caught my attention.

Any information is greatly appreciated. Keep up the great work; your CAI is the bees knees!

Thanks!

Dale

Dale

“Our new assemblies will be the highest flowing, least restrictive downpipes on the market that will not require any type of ECU calibration or tuner for installation.”

Is it safe to say that this down pipe will not trigger any CEL? Or will it still require a Ktuner or Hondata to disable the CEL?

Leave a comment

All comments are moderated before being published