Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--2A few weeks ago, Sean R of the LAPD Racing program reached out to us for our input on building a “Street Legal Modified” Fiesta ST for autoX/RallyX use. With a bit of input from the Mod Experts and ST specialist Nick, Sean and his son have taken on turning their new Race Red Fiesta ST into a rallycross/trackday beastie – and after today, they’re well on the way to making that happen.

Check it out in the video below or just read on to see how it all turned out.


Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--6 Since we saw the car last (we installed a Cobb Tuning AccessPORT for Fiesta ST with Stage I 91 Off-the-shelf mapping), Sean and son have fitted their ST with an MBRP Cat-Back Exhaust system to give it a bit more aural character, and since it’s all after-the-cat, that means you can still pass smog.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--7We had quite a few upgrades in store to be installed – the full Cobb Tuning Stage II suite for Fiesta ST and then some, including: Cobb Tuning Front Mount Intercooler + Chargepipes, Cobb Intake for Fiesta ST, Cobb Rear Motor Mount, a mountune Quick Shift Kit for Fiesta ST and the Rally Innovations front light plate for Fiesta ST.
Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--9 The Cobb Intake for Fiesta ST is unique on the market in that it features all-plastic construction. Every other intake on the market is made of aluminum, which is an excellent conductor of heat, meaning it also can absorb and trap heat – plastic, on the other hand, is an excellent insulator, meaning that intake air temperatures aren’t affected even if the tube gets super hot on the outside.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--11 The mountune Quick Shift Kit for Fiesta ST features a 30% reduction in shift effort/travel – it’s a bit hard to see, as the intake usually covers it up, but it makes for a much better feel with the gearbox.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--13 Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--14 The oversize tips of the MBRP Catback Exhaust for Fiesta ST fill the opening really nicely and look great on the car.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--15 Here’s another angle, from this view you can tell the dual round tips are staggered slightly for a sportier look.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--16 Here’s how the Rally Innovations Front Light Mount for Fiesta ST looks mounted on the car – it really “completes the look” the LAPD Racing Rally-X Project Fiesta ST had going on.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--17 The light plate has mounting provisions for a variety of different configurations – but for the classic “rally” look, we went with quad round lights across the front of the car.Fiesta_ST_Red_Cobb_StageII_Mountune_MBRP_Catback_teamdynamics--18

All in all the build really came together nicely, and Sean tells us their plan is to upgrade the car’s cooling system and improve its boostholding capabilities with a Turbosmart Kompact Shortie BOV for Fiesta ST and Turbosmart IWG-75 Wastegate for Fiesta ST to ensure the car performs to the fullest of its potential.

Interested in getting more power out of your ST? Need something installed? Talk to the Mod Experts, give us a call at 714-582-3330 to chat with our team of experts or stop by the ModAuto showroom in La Habra CA any day during business hours.

Thanks for reading, see you next time!

Story, Photos & Video Nick Gregson

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