The B907-C907 catback replaces the restrictive factory piping on the Fiesta ST with a full 3 inch mandrel bent T304 stainless steel system. Thermal R&D built this exhaust to free up the turbo while keeping the cabin quiet at cruising speed, so the car sounds purposeful under throttle and civil on the highway.
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2014-2019 | Ford | Fiesta | ST |
| Detail | Value |
|---|---|
| Manufacturer Part Number | B907-C907 |
| Pipe Diameter | 3 inch |
| Material | T304 Stainless Steel |
| Tip Style | Dual 2.5 inch angle cut, polished |
| Construction | Mandrel bent, mill finish tubing |
| Drone Control | True Helmholtz Technology, dual resonator |
| Warranty | Lifetime |
| Country of Origin | Manufactured in the USA |
Thermal R&D designs and builds every exhaust system in house in the USA, using microphone based frequency testing to target drone before it ever reaches the cabin. The B907-C907 for the Fiesta ST was one of the platforms Thermal engineered specifically around, tuning the resonator placement to match the 1.6L EcoBoost turbo character rather than using a generic off the shelf muffler.
The B907-C907 is Thermal R&D's 3 inch T304 stainless steel catback exhaust system built specifically for the 2014-2019 Ford Fiesta ST, finished with dual polished 2.5 inch angle cut tips.
Will this exhaust trigger a check engine light?No. The B907-C907 connects behind the factory catalytic converter and does not touch any emissions sensors, so it will not trigger a check engine light on the Fiesta ST.
Is this a difficult install?Most installers finish the B907-C907 in under two hours using factory hangers and basic hand tools. No cutting or welding is required.
Does this exhaust drone on the highway?Thermal R&D added a straight through mid pipe resonator plus a rear resonator specifically to cancel the low frequency drone that shows up in many 3 inch systems, so highway cruising stays comfortable.
Do I need any tuning after installing this exhaust?No tuning is required for this catback system since it is installed behind the catalytic converter and does not change fueling or turbo behavior.
What is covered under the warranty?Thermal R&D backs this system with a lifetime warranty against manufacturing defects in materials and welds.
Will the polished tips discolor over time?The tips are polished stainless steel, so heat tint can appear with aggressive driving, but it typically polishes back out with a stainless cleaner.
Can I run this exhaust with a downpipe upgrade?Yes, this is a catback design so it pairs with any compatible aftermarket downpipe without modification to the catback itself.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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