Horsepowerfreaks Goliath?

87supraturbo · 12-19-2005, 10:03 PM

Yea I plan to upgrade my turbo eventually, but right now i wanna run just a full cat back with no cats and a test pipe, so as far as i know they only make dp's and test pipes in 3 inch, so I'm still confused as to how they both up with the goliath being 4 inch?

Matt

kwnate · 12-20-2005, 12:40 AM

The piping reduces to a 3" flange. It will bolt to any of these test pipes http://www.horsepowerfreaks.com/pric...ust/Test_Pipes. Call HPF's and talk to Jeff.

j3pz · 12-20-2005, 02:00 AM

4"? lil excessive isnt it? doesnt really help any going from 3 to 4 does it? im just gonna get one of those 3"downpipes with the elbo on it and from there 3" piping bent the same as stock and hangers welded on in stock position, and weld a muffler with a silencer

kwnate · 12-20-2005, 02:08 AM

You're right it won't make much a difference, until you slap on a big turbo, then it'll be worth it. Anything you can do to improve flow on the exhaust will increase hp and reduce heat. I'll be running a 3.5" dp straight into this 4" with my new setup. If i had 3" or even 3.5" I wouldnt make as much power. If youre not going big, the 3.5 goliath is still big and is stainless, you'll never need a new one.

joel w · 12-20-2005, 02:46 AM

hope this is ok, but i read Xmans post and jeff from hpf said this on sm once and i though it was interesting for sure and it stuck with me....

Quote:For the naysayers who think 4" is just for show, read this:

Originally Posted by X-man
I dynoed tonite with my 3 inch exhaust system back on the car and found out some interesting comparisons. My previous dyno runs had been at 19 psi on my SP67 p trim with a .68 a/r with 4 inch exhaust and had produced a best of 518 rwhp/ 475 rwtq... Tonite with no other changes produced 425 rwhp/ 418 rwtq and dropped the boost to 17 psi.

In short:
3" exhaust with SP67: 425 rwhp/ 418 rwtq (17psi)
4" exhaust with SP67: 518 rwhp/ 475 rwtq (less backpressure raised boost to 19psi with no change to boost controller setting!) Quote:

so i would tend to believe 4" it definately worth it for big turbos..

12-19-2005, 10:03 PM	#1
87supraturbo 3" Exhaust Join Date: Aug 2005 Posts: 56	Yea I plan to upgrade my turbo eventually, but right now i wanna run just a full cat back with no cats and a test pipe, so as far as i know they only make dp's and test pipes in 3 inch, so I'm still confused as to how they both up with the goliath being 4 inch? Matt __________________ K&N FIPK

12-20-2005, 12:40 AM	#2
kwnate SP58GT Join Date: Jul 2005 Location: USA Posts: 633	The piping reduces to a 3" flange. It will bolt to any of these test pipes http://www.horsepowerfreaks.com/pric...ust/Test_Pipes. Call HPF's and talk to Jeff. __________________ Nate

12-20-2005, 02:00 AM	#3
j3pz 500whp yet? Join Date: Nov 2005 Location: Mechanicsville, MD, US of A, 20659 Posts: 1,060	4"? lil excessive isnt it? doesnt really help any going from 3 to 4 does it? im just gonna get one of those 3"downpipes with the elbo on it and from there 3" piping bent the same as stock and hangers welded on in stock position, and weld a muffler with a silencer __________________ 88 N/A w/ 5spd - stock - not running, bhg 87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat

12-20-2005, 02:08 AM	#4
kwnate SP58GT Join Date: Jul 2005 Location: USA Posts: 633	You're right it won't make much a difference, until you slap on a big turbo, then it'll be worth it. Anything you can do to improve flow on the exhaust will increase hp and reduce heat. I'll be running a 3.5" dp straight into this 4" with my new setup. If i had 3" or even 3.5" I wouldnt make as much power. If youre not going big, the 3.5 goliath is still big and is stainless, you'll never need a new one. __________________ Nate

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12-20-2005, 02:46 AM	#5
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	hope this is ok, but i read Xmans post and jeff from hpf said this on sm once and i though it was interesting for sure and it stuck with me.... Quote:For the naysayers who think 4" is just for show, read this: Originally Posted by X-man I dynoed tonite with my 3 inch exhaust system back on the car and found out some interesting comparisons. My previous dyno runs had been at 19 psi on my SP67 p trim with a .68 a/r with 4 inch exhaust and had produced a best of 518 rwhp/ 475 rwtq... Tonite with no other changes produced 425 rwhp/ 418 rwtq and dropped the boost to 17 psi. In short: 3" exhaust with SP67: 425 rwhp/ 418 rwtq (17psi) 4" exhaust with SP67: 518 rwhp/ 475 rwtq (less backpressure raised boost to 19psi with no change to boost controller setting!) Quote: so i would tend to believe 4" it definately worth it for big turbos..