MST FL5 Intake Pre-Order + FREE SILICONE INTERCOOLER HOSES

[22Si]

Hey I am actually in the final stages of designing a catted downpipe NO CEL. More info to come but here is all the information about MST downpipe. I should get more updates this week and take pre orders soon.

Join my facebook group for updates. The owner is in it of MST https://www.facebook.com/share/g/1Bev6oycQ3/


Most aftermarket downpipe dyno results are tested on tuned cars.

We wanted to answer a real question:

How much power does a downpipe add on a completely stock tune?

So we tested it.

⸻

Test vehicle: FL5 Civic Type-R

ECU: 100% stock (no tune)

Intake: MST Intake

Dyno Results

Stock downpipe + MST intake

→ 320 whp / 478 Nm

MST 300-cell catted downpipe + MST intake

→ 327 whp / 480 Nm

⸻

What we found

• Peak power difference is small

• Realistic gain: ~8–10 hp

• Max gain (10 hp) (12 nm) around 5000 rpm

• Results were consistent across multiple runs

Honest conclusion:

On a completely stock tune, a downpipe alone does not produce big peak gains.

This is real data — and it’s rarely shared.

⸻

Why MST Catted Downpipe

• Enlarged tubing

• Large 5” catalytic converter

• 300-cell high-flow cat

• No CEL guarantee

• No exhaust odor

• Designed to pass U.S. emissions

• 2-year cat warranty

• Target price under $750

⸻

Final thoughts

The Type-R is a unique platform.

More parts don’t always mean more power.

Without a tune, gains will be limited.

With proper tuning, real performance gains begin.

At MST, we build parts backed by real testing — not hype.

I may be wrong on this but I thought FL5 has torque-based targeting. If you add a high-flow downpipe, the ECU detects the increased efficiency and automatically closes the wastegate or throttles the engine to keep torque output within its factory-defined limits.

To actually "unlock" the power gains from the hardware, you must use a flash tune to raise those internal torque ceilings?

@Jester04

 

[SBX Performance]

I may be wrong on this but I thought FL5 has torque-based targeting. If you add a high-flow downpipe, the ECU detects the increased efficiency and automatically closes the wastegate or throttles the engine to keep torque output within its factory-defined limits.

To actually "unlock" the power gains from the hardware, you must use a flash tune to raise those internal torque ceilings?

@Jester04

I AM NOT A TUNER I am just a parts guy (Not even a mechanic) this is my opinion on whats going on. The dyno sheet here is just MST Intake and no other mods! Car did a baseline run with OEM Intake. Same dyno etc

Two runs:

• Red = Baseline
• Blue = MST Intake only

Peak Numbers (from the legend):

• 309 whp → 330 whp (+21 whp)
• 327 wtq → 354 wtq (+27 wtq)
• Boost: ~21.5 psi → ~24.7 psi max

And in the circled section:

• Baseline ~19–21 psi up top
• MST ~22–24 psi up top

boost is clearly higher with just the intake. It did hit 35 tq in mid range

I AM NOT A TUNER this is my opinion on whats going on

By the data we have so far and yes the FL5 is torque based so in theory the ECU will try to keep torque within its modeled limits. But that doesn’t mean it automatically pulls boost every time you add a bolt-on.


with just the MST intake my opinion is that has to do with more efficiency than anything and velocity into the turbo. The intake reduces restriction before the turbo so the turbo can move more air easier. The long curved silicon hose allows the intake to build more velocity into the inlet pipe and into turbo. The ECU is still targeting torque but since the system is flowing better, it may end up running a little more boost to hit its airflow target. That’s why you’re seeing the boost go up on the dyno instead of down. This is a completely different intake design than anything else on market. The MAF is also is a great cool spot compared to the other intakes so it will keep it nice and cool.


Torqu -based control doesn’t mean “no gains without a tune.” It just means the ECU manages output based on calculated torque. Mild bolt-ons like an intake can still show real gains on stock tune especially if they improve efficiency.


To really maximize it and raise the torque ceilings, that’s when a flash tune comes into play but the intake alone can absolutely make gains which is what that dyno is showing.

 

[Jester04]

I may be wrong on this but I thought FL5 has torque-based targeting. If you add a high-flow downpipe, the ECU detects the increased efficiency and automatically closes the wastegate or throttles the engine to keep torque output within its factory-defined limits.

To actually "unlock" the power gains from the hardware, you must use a flash tune to raise those internal torque ceilings?

@Jester04

So you can see gains without a tune doing some bolt ons. But to take advantage of that a tune will yield dividend better than just bolting them on. The car has some room on the factory limits to get some partial benefit from better parts.

 

[SBX Performance]

more happy customers!!!

 

[champ_white_FL5]

more happy customers!!!

Eagerly awaiting fuel trim data!

 

[SBX Performance]

Eagerly awaiting fuel trim data!

I’ll see if I can get a customer log to share but so far the feedback we haven’t seen any abnormal fuel trims or red flags. Everything has been within normal range on stock tuning

 

[marcusm86]

Eagerly awaiting fuel trim data!

I put the stock intercooler hose back on today and am running it again. Ended up getting a code for air leak after the MAF. Gonna have to try to reinstall it when i can get underneath it as well i guess? My other issues seem to have gone away as well but need more drive time.

 

[SBX Performance]

I put the stock intercooler hose back on today and am running it again. Ended up getting a code for air leak after the MAF. Gonna have to try to reinstall it when i can get underneath it as well i guess? My other issues seem to have gone away as well but need more drive time.

not saying you installed it wrong but I helped a few people fix issues already always something small during install that was missed etc let me know if you need help

 

[SBX Performance]

For anyone that gets it Orientation for it! This is key! Also the grommet is important so it’s secured and doesn’t vibrate it can throw off the sensors at high RPM

 

[marcusm86]

not saying you installed it wrong but I helped a few people fix issues already always something small during install that was missed etc let me know if you need help

ill make sure to get more pictures when i try next time, but i made sure the intercooler side was flush and then when i got to the throttle plate side it didnt seem to be quite long enough. I tried to get the clamp on just at the hump to get it to seal. I think getting underneath it instead of messing with it during work will be my best bet.

 

[SBX Performance]

ill make sure to get more pictures when i try next time, but i made sure the intercooler side was flush and then when i got to the throttle plate side it didnt seem to be quite long enough. I tried to get the clamp on just at the hump to get it to seal. I think getting underneath it instead of messing with it during work will be my best bet.

Ah when I installed mine I got under the car just to make sure I secured it. Mine was the same way but you just gotta wiggle it and finese it a bit to get it on. They are tight for sure but for a good reason. DM me today if you work on it. TQ the clamps down well also!

 

[22Si]

I moved recently and couldn't find mine, but I should get a cheapy in tomorrow. I gotta replace that last coupler with the stupid clamp, and i wanna double check the metal piece that goes around the MAF. I had felt a weird potential miss only when decelerating around 2700 rpm - was only a few times and it may have just been me... i get hypersensitive for about a week after i do something to my car lol.

EDIT: wont be getting the scanner til saturday

Any word on the fuel trims?

 

[marcusm86]

Any word on the fuel trims?

not sure exactly what you are wanting but lmk if u want something different @champ_white_FL5 u too lol

 

[champ_white_FL5]

not sure exactly what you are wanting but lmk if u want something different

4.7 long term is decent. Is this at idle? Does long term go down once you start driving?

 

[marcusm86]

Idle yes - long term goes down a bit when driving

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