Downpipe differences

[Scrodee]

Just thought I’d share this for info:

https://www.integraforums.com/forum/threads/comprehensive-downpipe-thread.52678/

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[Nikw91]

Just thought I’d share this for info:

https://www.integraforums.com/forum/threads/comprehensive-downpipe-thread.52678/

RV6 3” vs TSP 5”

Seems like a pretty big difference

 

[Se-BASS-tian]

I done some research on the market and I see given Options (I'm from Europe so maybe some emission level is different between countries in EU and states in USA) :

• HJS Motorsport - Sports-Cat Downpipe
  • Maintain EURO 6 emission requirements
  • 200cpsi Stainless Steel Primary Catalyst + 300cpsi Stainless Steel Secondary Catalyst
  • No CEL (Check-Engine-Light)
• Milltek Sport - 5" 200 Cell Race Cat Downpipe
  • 200cpsi Catalyst
  • No info about CEL
• Milltek Sport - Downpipe With HJS High Flow Sports Cat
  • 200cpsi HJS Catalyst
  • No info about CEL
• Milltek Sport - Downpipe with Twin 200 Cell HJS Cat
  • 200cpsi HJS Primary Catalsyt + 200 cpsi Secondary Catalyst
  • No info about CEL
  • Very expensive !!!
• RV6 High Temp Catted Downpipe
  • 300cpsi Catalyst
  • probably CEL (Check-Engine-Light)
• 27WON Performance Downpipe
  • 200cpsi Catalyst
  • CEL (Check-Engine-Light) will definitely come on without tune
• Two Step Performance (TSP) Catted High Efficiency Downpipe
  • 400cpsi GESI G-SPORT catalyst
  • No CEL (Check-Engine-Light)

For customer that don't want tune their ECU, TSP Downpipe is on 1'st place.
It seems that a value of 300cpsi can CEL on, while a value of 400cpsi is safe. 200cpsi and below I think can CEL on for every downpipe with this value.

I wonder about one more thing in all this. What is the characteristic of a downpipe consisting of two catalysts (e.g. HJS consists of 200cpsi primary catalyst and 300cpsi secondary catalyst). Are these values added up or are these downpipes treated differently? It also seems to be a good candidate for European market (produced in Germany so it will be easier to buy than TSP), but won't it be very close to the OEM value?

By the way, how much CPSI does OEM have?

 

[Tougefl5]

Keep them as close to stock as possible. Canflex and tune your over 350 to the wheels safely and for little money. If you like burning money then plan on 10k and better to be 400+

 

[Rhorn]

Do downpipes at all help lower oil or coolant temperatures?

 

[BigBird]

Do downpipes at all help lower oil or coolant temperatures?

No

 

[Nikw91]

No

How much does having heat shields make a difference versus not having them? Will it raise the temperature a lot under the hood and affect the intake temps?

 

[BigBird]

How much does having heat shields make a difference versus not having them? Will it raise the temperature a lot under the hood and affect the intake temps?

No clue on the difference, but the heat shield, wait for it.......shields heat

 

[Tougefl5]

How much does having heat shields make a difference versus not having them? Will it raise the temperature a lot under the hood and affect the intake temps?

Only hard street driving didn't see much of a difference with coated RV6 dp.

 

[Nikw91]

Only hard street driving didn't see much of a difference with coated RV6 dp.

But you have the oem shield on it looks like

What are the benefits of the coating?

 

[Tougefl5]

But you have the oem shield on it looks like

What are the benefits of the coating?

Lower is for the coolant and I was too tired to remove it. The top that's un shielded would be the hottest close to intake.
The temps are pretty much close to what they were stock. I've got kuro turbo so it should be hotter then oem.
I'd say the coating is better than OEM heat shield.

 

[Unity Performance]

Keep them as close to stock as possible. Canflex and tune your over 350 to the wheels safely and for little money. If you like burning money then plan on 10k and better to be 400+

There's a relatively inexpensive way to get well into 400's without breaking the bank, here's what we did with our first FL5

27WON Kuro = $1,992.71
27WON Downpipe = $792.71
PRL Intercooler = $799
Hondata FlashPro = $795

Total in parts is $4,379. $621 balance remaining goes towards ECU unlock + custom tuning. $5,000-$5,250 is easily doable, especially during holiday sales.

We made 430/387 on the Dyno with DRob, it was a great setup to have when not many parts were available yet in 2023.

 

[Tougefl5]

There's a relatively inexpensive way to get well into 400's without breaking the bank, here's what we did with our first FL5

27WON Kuro = $1,992.71
27WON Downpipe = $792.71
PRL Intercooler = $799
Hondata FlashPro = $795

Total in parts is $4,379. $621 balance remaining goes towards ECU unlock + custom tuning. $5,000-$5,250 is easily doable, especially during holiday sales.

We made 430/387 on the Dyno with DRob, it was a great setup to have when not many parts were available yet in 2023.

430 to wheels without injectors and HPFP. That dyno is reading high as shit.

 

[Unity Performance]

430 to wheels without injectors and HPFP. That dyno is reading high as shit.

Same dyno we've used to tune our FK8, both FC1's, FC3, sent a number of customers to and seen other 10th and 11th Gen customers post numbers that are in line with other dyno's. New FL5 will be going there for a baseline, and DE5 will be headed there after all the RV6 parts go on as well

DRob can say from experience that the FL5/DE5 has a slightly higher ceiling for it's factory fuel system, whereas the FK8's stock fuel system wouldn't go past 415whp. After the FS upgrade the FK8 did 470whp, which lines up with what him, Corey, and others have all gotten out of the Kuro at 100%

 

[Tougefl5]

Same dyno we've used to tune our FK8, both FC1's, FC3, sent a number of customers to and seen other 10th and 11th Gen customers post numbers that are in line with other dyno's. New FL5 will be going there for a baseline, and DE5 will be headed there after all the RV6 parts go on as well

DRob can say from experience that the FL5/DE5 has a slightly higher ceiling for it's factory fuel system, whereas the FK8's stock fuel system wouldn't go past 415whp. After the FS upgrade the FK8 did 470whp, which lines up with what him, Corey, and others have all gotten out of the Kuro at 100%

I've been putting cars on a dyno since 07 and know for a fact that dynojet reads high. You might get a number that's higher than the avg for a run doesn't mean it's constant for a lot of reasons. You could probably hit over 400 9n stock turbo. Might not make it off the dyno though lol
Put the car on a mustang dyno show the mods and fuel then I'd believe you.

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