P1-Underground Tuning

P1-Underground Tuning P1 Underground Tuning is a full service location that completes installs on all cars and trucks including engine swaps, go fast parts, long tube headers, etc.
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We are located at 808 Jonesboro Rd West Monroe, LA 71292

Come on out and see us!

We are truly excited to announce that today we secured a partnership with MAZ! We are dealers for their parts. Their hoo...
07/15/2026

We are truly excited to announce that today we secured a partnership with MAZ! We are dealers for their parts. Their hood will be on full display on Marc's S650 when it arrives.

If you are looking for Carbon Fiber hoods for your Mustang, please reach out to us and we will get you taken care of!

07/14/2026

Hey everyone, one of our guys found a wallet in the parking lot. Mr. Jackson, if you are looking for your wallet, please come by the shop. We have it.

Please share this. So this gentleman can get his belongings back.

07/12/2026

MAZ Carbon Hoods are absolutely legit. Sheesh, this is nice.

07/11/2026

Honest review of the ported Cobra Jet after 24 hours.

One word: Wow
7800 to 8000 rpm shifts with little to no issues at all. The power band has increased dramatically. After some refinement on VCT settings, I'm incredibly curious to see the gains once we put it on the dyno.

Sadly, we didnt have a chance to put it on the dyno yesterday and will more than likely wait until the heat subsides. The seat dyno feels good of course.

So far, here is the updated list on Marc's car.

Ported Cobra Jet
Boshma Adapter
170 thermostat
K&N CAI
2M Fab LTH
GT500 Injectors
Eibach lowering springs
HP Tuners file on 93 and E85
PCMtec file will be completed tonight

Once we get everything together, we will put together a package deal with LTH, Ported Cobra Jet, Adapter, full installation and tune.

Thanks again everyone for supporting our team over here and following.

On the right, we have a Predator blower and waiting for the vmp kits. On the left, a 1320 ported Cobra Jet with a John B...
07/10/2026

On the right, we have a Predator blower and waiting for the vmp kits. On the left, a 1320 ported Cobra Jet with a John Boschma adapter.

It's going to be a late evening for sure.

Today on the rollers and getting some love is John's 2020 Ford Mustang GT. We are adding Stainless Works long tube heade...
07/07/2026

Today on the rollers and getting some love is John's 2020 Ford Mustang GT. We are adding Stainless Works long tube headers, HP Tuners RTD4 for 93, ghost cam and E85.

His base pull came out to 407hp and 391lbs of torque.

We did use STD since our shop is not climate controlled.

We will do a pull after the long tubes are installed and after 20 miles of driving, to see what the Stainless Works adds. After that, a few pulls on the tune file.

07/05/2026

https://www.facebook.com/share/v/1DH9mahLbX/

For our counterparts over at Riverside Racecraft, we are glad you are ok. If you guys know anything about Zoloft, nobody wanted to race this car. Nobody also wanted to see this happen.

They will come back stronger.

RCA100 Long Tube Headers$650.00
07/05/2026

RCA100 Long Tube Headers
$650.00

07/04/2026

Happy 4th of July everyone! In celebration of today, how about a burnout challenge? Here is Bobby and Marc at the track. Lets see yours!

Address

808 Jonesboro Road
Monroe, LA
71292

Opening Hours

Monday 12pm - 8pm
Tuesday 12pm - 8pm
Wednesday 12pm - 8pm
Thursday 12pm - 8pm
Friday 12pm - 6pm
Saturday 9am - 5pm

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