xtyper

Being a bit bored without any local drag event to attend, I decided to hit the dyno again to see where my car stood with the tune fully settled in. I had also since added an MBH X-Pipe and was curious if that affected the results at all. So back I went this evening to visit Seb at Specialty Z in Chatsworth, CA.

Given my limited mods and crappy gas, I was pleasantly surprised to find my power had improved a bit from the last visit. Same dyno, same operator, similar ambient conditions, and again SAE corrected.

Mods at time of dyno (Dynojet 224xLC):
Charcoals removed, AFE Pro Dry filters, MBH headers, MBH catless midpipes, MBH X-Pipe, Kleemann Stage 2 tune, 91 octane Chevron fuel, 5th gear
Peak power = 472whp/431wtq SAE Corrected

The car was run 4 times and each run produced similar results, with only the final one showing a bit of timing pulled in the midrange (likely due to heatsoak). I was also very pleased to once again see a safe AFR curve.

Comparing my results to those recently posted by several of the East Coast leading performers, also done on a Dynojet, I'm hopeful that I can lay down some impressive numbers at the track when finally given the chance.

Until then...

jacob502

Nice gains man. Get yourself a renntech airbox and you should be hitting 480RWHP

no loser

Nice Numbers Really it`s improving from last time you did dyno
Yeah As he said Jacob getting the renntech airbox and absolutely you will see more numbers

xtyper

Im considering it, but waiting for the release of their new design.

dodger63

Great numbers, get to the track and let's see some rusults

PetroC63

Awesome numbers Eric!

The X-pipe seemed to help a bit.

Did the exhaust tone change much after adding the X-pipe?

xtyper

Thanks Mike. Yes, exhaust note at WOT improved a lot and became more "refined".

xtyper

Thanks Mike! And I'm workin on that getting to the track part.

Sincity

Did it take away some of the raspiness? It did on my K2. I would guess that the X-pipe would make the LTs more tolerable in the sound dept?

xtyper

Exactly how I would describe the effect.

PetroC63

Eric,

The X-pipe replaced the stock resonator, correct?

Would love to hear a sound clip, if possble.

xtyper

No, the X-Pipe replaced the back section of the catless midpipes, connecting to the stock resonator. I will work on getting a sound clip for u.

Maverick1975

Catless midpipes plus headers makes for some serious decibels! After following one of my cars which has LTHs on a recent
roadtrip i was afraid i decided i had to quieten the exhaust ...and i have even had sports cats... The noise was so offensive I was
embarrassed!! I couldnt feel like when i was i n the drivers seat that i could go amy where near the throttle in suburbia. The noise of
headers and no cats must be off the charts!

PetroC63

I see.

Thanks.

Merc63

Did this X pipe quiet things down a bit more without cutting power??

My exhaust is so loud, the sound waves bounce off my neighbors houses and wakes up the entire community lol.

xtyper

The X-Pipe actually made power compared to my previous best pull on this dyno in similar conditions. I will post a graph later today comparing before and after. Midrange torque seemed to really pick up, and in some places gained 20wtq!

Jons95c36amg

Nice! What were the AFR?

xtyper

Original post updated with actual dyno graphs showing power, conditions, and AFR.

Thanks guys for all the positive remarks.

xtyper

Thanks Jon. See updated graphs posted for AFR curve.

BenzoBoi

Nice nice! Look forward to your track times in the future!

C63newdude

Great numbers before, even better numbers now..

Mort

Great numbers, looks very strong, GL at the track.