Project 5.2 ... from the depths of the laboratory abyss ... ascend twin 'goth valves'

Looking forward to seeing/hearing the video and dyno results.

 

From this...
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To This...
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Much cleaner setup for sure

 

Looking forward to soundclips.

If there is no drone at cruising speeds and yet the F1 shriek can be achieved, I'm keen to get one set.

 

Any updates?

 

Goth,

I've got a no muffler custom pipe arrangement but would prefer a cleaner challenge exhaust setup for I already have the mounting bracket. Let me know if you want to build me one and the cost.

 

When are you going? I have a conflict that date but if it's early I can meet you there. The sound from this beastly set up is unworldly! Can't wait to see the guys at the dyno when you fire it up and shread it to red line. Sean is going to be stunned.

If the results are what we think, then the 348 crowd is going to want their version.

 

Sent you a pm goth

 

... are in. Greatest delta was around 30 hp more at ~6400 rpm.

Remember, this is the difference between aftermarket cat-back exhausts; the improvement should be greater from a stock exhaust set up.

I am also running OEM headers, with 200-cell hi-flow cats on both runs.
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Alex's gothspeed exhaust sounds INSANE! I have honestly never heard a better sounding 355 in person EVER! I Went down to the dyno test yesterday, and just missed the last pull by minutes. However, Alex took me for a ride afterwards. The first time the bypass opened up the PURE old school F1 SHRIEK made me laugh out loud, like a little kid! It was such an awesome sound. Not only that but, the jump in power, both hp & tq, Ozzy's exhaust made causes the wheels to break loose when the bypass opens up at low speeds. Looking at Alex's graph you can see from about 3800-ish/rpm to about 4300 rpm the ramp up in torque is around 70lb/ft in a span of about 500/rpm. From 4000-5000/rpm there is a 100hp ramp up in power. You can definitely feel the push, and it continues to pull as the rpms rise.

I also asked Alex to just drive at normal speed, and it is very docile and mellow. Basically virtually stock sounding, except at a slightly higher pitch. I drove past him on the freeway at cruising speed, and you have no idea it is a custom exhaust. Quiet as can be. But MAN OH MAN when the bypass opens it sounds like there is an F1 race car prowling the street. The gothspeed muffler is a total, and I mean TOTAL ........ Dr.Jeckel - Mr.Hyde exhaust. In my opinion it is a master piece, and Ozzy has TRUELY outdone himself with this. His finest work yet!

Bravo Oz, ...... BRAVO!!!

 

Was there too and I can confirm. The numbers don't lie. Unbelievable. Im considering a 348 version if goth is willing, but I don't want to distract him from doing his own car. Plus Sean the owner of the dyno shop and a professional tuner was impressed with the gain.

 

Thats really nice
Goth found something for sure, credit due !!!!!

 

I have one of Goth's exhaust and I gained 22rwhp after it was installed. And that is with Fabspeed headers and Hyperflow cats already installed.

 

Guys, please.

A sound clip or u-tube vid. Please!!

This sounds like exactly what I've been looking for to pass my vehicle inspection every two years.

They measure the db during the inspection and right now I have to put the factory muffler to pass the inspection and then put my tubi back on afterwards and I'm sick of doing it.

 

Alex needs to get a set of headers and then get his ecu tuned. There is still more power to be found.

 

Agreed. Dare I say that he could surpass goth's numbers? :O Wasn't goth at about 360 at the hubs with his cats and Fabspeed headers?

 

That 5.2 ECU is a bear but were so damn close I can taste it

,,

 

Nice work Oz.

 

We took some videos and sound clips after the dyno, Oz is editing them as we speak. Stay tuned! Start connecting your computer sound card to a set of high end speakers or to your hifi system and be prepared to be blown away by the sound track!

Though the original intention of this system isn't to just pass inspection ;-) it'll do the job. Idle, cruising, and light throttle it is just a quiet as stock (just a different higher pitched character), but by all means do not let that inspector floor the throttle!

;-)

 

Somebody needs to crack that 5.2 code ASAP.

 

Really, Tim? You are close to deciphering the 5.2? Please keep us updated.

I'll be working on my C.O.P. system next.