[Bman14665]

I installed G-Power's V2 "750hp" tune and downpipes (with a single sports catalyst on each downpipe) on my 2018 M5. I also installed an Eventuri intake and Eisenmann standard exhaust with their non resonated center section. Here are my results (same dyno, stock vs after all mods, 5th gear, ECM Dynocom Dyno).

Stock:
569 wheel hp
544 wheel ft/lbs
80 db peak sound idle reving

After Mods:
671 wheel hp
674 wheel ft/lbs
84 db peak sound idle reving

Drivability is great, outside the increased exhaust noise you can't tell it isn't stock until you go deep into the throttle. Car is much louder now with much more turbo noise coming from both front and rear. Idle reving does it no justice, the car needs to be under some load to understand how it sounds. I haven't seen much posted on G-Power so I thought I'd share my results.

If you are interested talk to Edmond at EasyB Car Solutions in Katy Texas. He is an authorized US G-Power dealer and can upload the tune remotely. I did mine from Florida remotely with him. Great customer service, I highly recommend him if you want to go with G-Power.

[Pimpsy]

Sick numbers

[MCOMP]

Welcome to the forum, thanks for the info, Great numbers, about how much was the investment?

[Bman14665]

Was about 8k for catted downpipes and tune but G-Power was running a 35% off sale on the tune when I bought. EasyB's prices are totally reasonable. If u check out G-Power's website and change the euro sign to dollars that is about what u will pay.

[limeypride]

Originally Posted by Bman14665

I installed G-Power's V2 "750hp" tune and downpipes (with a single sports catalyst on each downpipe) on my 2018 M5. I also installed an Eventuri intake and Eisenmann standard exhaust with their non resonated center section. Here are my results (same dyno, stock vs after all mods, 5th gear, ECM Dynocom Dyno).

Stock:
569 wheel hp
544 wheel ft/lbs
80 db peak sound idle reving

After Mods:
671 wheel hp
674 wheel ft/lbs
84 db peak sound idle reving

Drivability is great, outside the increased exhaust noise you can't tell it isn't stock until you go deep into the throttle. Car is much louder now with much more turbo noise coming from both front and rear. Idle reving does it no justice, the car needs to be under some load to understand how it sounds. I haven't seen much posted on G-Power so I thought I'd share my results.

If you are interested talk to Edmond at EasyB Car Solutions in Katy Texas. He is an authorized US G-Power dealer and can upload the tune remotely. I did mine from Florida remotely with him. Great customer service, I highly recommend him if you want to go with G-Power.

Excellent numbers... and thanks for posting the before+after--that really helps determine the legitimacy of the tune!

I only wish we could see the incremental gains at each step. I don't suppose you have that do you?

[Bman14665]

Sorry, I don't have incremental dyno numbers. The dyno is about 50 miles from my house plus I suspect the Eisenmann exhaust and Eventuri intake are mostly a sound upgrade. I'm sure most all of the gains are from the downpipe and tune.

[M5speed]

Why not go for the turbos also with all this?

I assume then this replaced the upper and lower downpipes both?

Also was there any thought as to going with sport cats vs no cats? I guess it should pass emissions then and reduce the chances of the fumes, right?

[Bman14665]

I just didn't want to drop the money on the new turbos. The car sounds right and is silly fast, couldn't justify the big extra cost for 50ish more hp.

I thought about going catless but I was concerned it might be too loud and I wanted to give it a chance at passing emissions without throwing the stock hardware back on.

It does replace the upper and lower downpipes with a single piece. It has a single high flow cat where the stock upper sits. No lower cat. Fit was perfect. I was able to swap them out myself in about 6-7 hours.

[Rennology]

So you did Eisenmann performance? Any videos?

[TrevorM3]

where in florida are you?

[Bman14665]

Beck, working on getting the right permissions to upload some exhaust vids.

TrevorM3, near Pensacola

[Austin_2019_X5_50i]

Originally Posted by Bman14665

Beck, working on getting the right permissions to upload some exhaust vids.

TrevorM3, near Pensacola

I just did a Velostune stage 2 and got 545WHP from the dyno. I need to get these downpipes but they are about $2700-$5K. How much more WHP do you think I will get if I install these downpipes?

[Austin_2019_X5_50i]

Originally Posted by Bman14665

I installed G-Power's V2 "750hp" tune and downpipes (with a single sports catalyst on each downpipe) on my 2018 M5. I also installed an Eventuri intake and Eisenmann standard exhaust with their non resonated center section. Here are my results (same dyno, stock vs after all mods, 5th gear, ECM Dynocom Dyno).

Stock:
569 wheel hp
544 wheel ft/lbs
80 db peak sound idle reving

After Mods:
671 wheel hp
674 wheel ft/lbs
84 db peak sound idle reving

Drivability is great, outside the increased exhaust noise you can't tell it isn't stock until you go deep into the throttle. Car is much louder now with much more turbo noise coming from both front and rear. Idle reving does it no justice, the car needs to be under some load to understand how it sounds. I haven't seen much posted on G-Power so I thought I'd share my results.

If you are interested talk to Edmond at EasyB Car Solutions in Katy Texas. He is an authorized US G-Power dealer and can upload the tune remotely. I did mine from Florida remotely with him. Great customer service, I highly recommend him if you want to go with G-Power.

The 2018 M5 has 600HP (crank). How can it have 569 WHP stock? You lose 15%.

[Bman14665]

Crank numbers will vary Dyno to Dyno

[Bman14665]

I'm not sure exactly how much you will pick up by installing downpipes with a proper tune. I'd guess about 50 more than a tune alone.

[Austin_2019_X5_50i]

Originally Posted by Bman14665

Crank numbers will vary Dyno to Dyno

Dynos don’t provide crank numbers. They provide HP/TQ at the wheels.

[Austin_2019_X5_50i]

Originally Posted by Bman14665

I'm not sure exactly how much you will pick up by installing downpipes with a proper tune. I'd guess about 50 more than a tune alone.

I got about 150 WHP with the tune. So you think I can expect 50 more WHP?

[Austin_2019_X5_50i]

Originally Posted by Austin_2019_X5_50i

I got about 150 WHP with the tune. So you think I can expect 50 more WHP?

Hello......

[onfireX5]

Originally Posted by Austin_2019_X5_50i

Hello......

Highly doubt it. Hard to find M5 before and after cat delete dyno's, but on the C7 Z06 with 650 HP there
is 15-20rwhp max. M5 will spool the turbos quicker without cats, but the DME targets total airflow so the gain up top will be limited. If I were in Vegas, the F90 bet would be 15 rwhp maximun due to the DME.

[Austin_2019_X5_50i]

Originally Posted by onfireX5

Highly doubt it. Hard to find M5 before and after cat delete dyno's, but on the C7 Z06 with 650 HP there
is 15-20rwhp max. M5 will spool the turbos quicker without cats, but the DME targets total airflow so the gain up top will be limited. If I were in Vegas, the F90 bet would be 15 rwhp maximun due to the DME.

So you think I’m only going to get 15 more WHP? It’s awd so should I expect 15 in the front and 15 in the back? Everyone thinks I will gain about 40-50whp but you think bc of the DME noticing airflow it will react and adjust so I’m not getting as much airflow as I could be? I want to get DP’s that let maximum air but just a little noise from exhaust and turbos. Basically sound stock until I step on it. I was planning on getting catalysts downpipes not catless. Your thoughts??

Thanks!

[onfireX5]

Originally Posted by Austin_2019_X5_50i

So you think I’m only going to get 15 more WHP? It’s awd so should I expect 15 in the front and 15 in the back? Everyone thinks I will gain about 40-50whp but you think bc of the DME noticing airflow it will react and adjust so I’m not getting as much airflow as I could be? I want to get DP’s that let maximum air but just a little noise from exhaust and turbos. Basically sound stock until I step on it. I was planning on getting catalysts downpipes not catless. Your thoughts??

Thanks!

Thanks to Miko, I've had both sets of stock cats on my flowbench. They flow better than a 2.50" open pipe but less than a 3.00" open pipe. My guess is 15rwhp total. I'd stay stock or open pipe for additional spool. Not much to gain by adding an aftermarket cat.

[Austin_2019_X5_50i]

I have two turbos in my X5 that have been tuned and your recommendation is to stay with stock pipes? The airflow is being restricted with these stock dp’s And exhaust. All I ever hear is “get your car tuned with downpipes”... You’re the first person to advise this. Anyone else want to chime in??