The most powerful exhaust system

aus · 08-23-2009, 09:37 PM

Quote:

Originally Posted by Jonmartin

Seemed to work for me.

Btw thats with a stock midsection that was decatted by some exhaust shop had I got my Gintani mid pipe I would have probably made more. In the second dyno that 354 number was with all the mods and the standard generic flash. And the 379 came after 25 pulls and a custom tune on the dyno Same day

Just curious why you'd expect more gains from the Gintani mid-section vs. a simple de-cat of the stock midsection?

Also, getting 25HP from a tune is REALLY impressive; especially considering you had a tune on already. Was that just a tune or does it also include deleting the primary cats in?

Jonmartin · 08-23-2009, 11:30 PM

Quote:

Originally Posted by aus

Just curious why you'd expect more gains from the Gintani mid-section vs. a simple de-cat of the stock midsection?

Also, getting 25HP from a tune is REALLY impressive; especially considering you had a tune on already. Was that just a tune or does it also include deleting the primary cats in?

I assume that i might have made more power because the stock piping has some funny looking bends and lil flatend areas and isn't as free-flow as the Gintani's setup. It might not have made more I'm just assuming. The Dynos I posted are all with the Deleted Primary & Secondary cats.

McLuVan · 08-23-2009, 11:32 PM

rpi gt or gintani

mixja · 08-24-2009, 01:02 AM

Akrapovic would be a close 2nd to Gintani/RPi - you lose around 50lbs of weight as well, which is about a 1.5% increase in power to weight...

Plus I'd suggest a more "civilised" exhaust note if that it was you are after...

Eugene-TAIWAN · 08-24-2009, 01:29 AM

Wow seems like its all about RPI and Gintani. I actually think the both set ups look quite similar.

aus · 08-24-2009, 02:01 AM

Quote:

Originally Posted by Jonmartin

I assume that i might have made more power because the stock piping has some funny looking bends and lil flatend areas and isn't as free-flow as the Gintani's setup. It might not have made more I'm just assuming. The Dynos I posted are all with the Deleted Primary & Secondary cats.

Didn't realize there were kinks/bends in the stock plumbing. Thanks and nice gains.

MrHarris · 08-24-2009, 02:27 AM

Quote:

Originally Posted by Eugene-TAIWAN

Wow seems like its all about RPI and Gintani. I actually think the both set ups look quite similar.

I think they look completely different...

Eugene-TAIWAN · 08-24-2009, 02:37 AM

Quote:

Originally Posted by MrHarris

I think they look completely different...

HOw so? beside the rear section I think its look very similar especially how the x-pipe is connected

powertrip · 08-24-2009, 03:04 AM

Quote:

Originally Posted by Eugene-TAIWAN

HOw so? beside the rear section I think its look very similar especially how the x-pipe is connected

The x-pipe design is way different (the Gintani is pushed as far up front as possible. Also, Gintani's connecting pipes go straight into the mufflers, where as RPI's makes a strange curve into the muffler. Most of the power from these systems come from ditching the restrictive cats, so I'm not sure that a person can prove that one is more powerful than the other.

McLuVan · 08-24-2009, 03:29 AM

Quote:

Originally Posted by powertrip

The x-pipe design is way different (the Gintani is pushed as far up front as possible. Also, Gintani's connecting pipes go straight into the mufflers, where as RPI's makes a strange curve into the muffler. Most of the power from these systems come from ditching the restrictive cats, so I'm not sure that a person can prove that one is more powerful than the other.

yeah
it probably is because of the cats
if turner made +40rwhp from primary cat delete + tune
and rpi gt made +45rwhp from full cat delete + tune
I don't think the exhaust design helps much in terms of power
so I think the tune is important because I thinkkk niterider? did a primary cat delete without a tune and gained like 3rwhp or something
don't quote me on this stuff
this is from my memory(I have bad memory)
it's hard to remember when the car has like 10 different cats and there's like 1000 different dynos tuners use
so if I'm wrong I'm sorry someone just correct me

Eugene-TAIWAN · 08-24-2009, 03:40 AM

Quote:

Originally Posted by McLuVan

yeah
it probably is because of the cats
if turner made +40rwhp from primary cat delete + tune
and rpi gt made +45rwhp from full cat delete + tune
I don't think the exhaust design helps much in terms of power
so I think the tune is important because I thinkkk niterider? did a primary cat delete without a tune and gained like 3rwhp or something
don't quote me on this stuff
this is from my memory(I have bad memory)
it's hard to remember when the car has like 10 different cats and there's like 1000 different dynos tuners use
so if I'm wrong I'm sorry someone just correct me

I just put my primary cats back in. Felt the car has a lot more jolt. I think it was the increase in back pressure from the cats. But I do however feel the car is slower on the highway.

Does more HP and means MORE Torque???

Eugene-TAIWAN · 08-24-2009, 03:42 AM

Quote:

Originally Posted by powertrip

The x-pipe design is way different (the Gintani is pushed as far up front as possible. Also, Gintani's connecting pipes go straight into the mufflers, where as RPI's makes a strange curve into the muffler. Most of the power from these systems come from ditching the restrictive cats, so I'm not sure that a person can prove that one is more powerful than the other.

I like what you have wrote!!! very interesting.

but does more HP also means more torque??? HP is good more I think its also trying to find the perfect balance between HP&Torque

ersin · 08-24-2009, 04:17 PM

Quote:

Originally Posted by Eugene-TAIWAN

I like what you have wrote!!! very interesting.

but does more HP also means more torque??? HP is good more I think its also trying to find the perfect balance between HP&Torque

Huh? There's no balancing between hp and torque. P = t * rpm. If P is in horsepower and torque in ft-lbs then P(hp) = t(ft-lbs) * rpm / 5252. (The 5252 is different if different units are used.) There are two ways to increase horsepower - increase torque and increase rpm. For a given rpm, torque and power are directly related.

Nawaaz · 08-24-2009, 05:15 PM

Quote:

Originally Posted by Eugene-TAIWAN

I thought it was installed already? I meant the exhaust. ??

I've already ordered my full exhaust from Gintani. It'll arrive in a few more weeks. I'll have it installed by the beginning of October at the latest.

Sorry for the confusion.

Eugene-TAIWAN · 08-24-2009, 08:31 PM

Quote:

Originally Posted by Nawaaz

I've already ordered my full exhaust from Gintani. It'll arrive in a few more weeks. I'll have it installed by the beginning of October at the latest.

Sorry for the confusion.

Kool, let me know

Nawaaz · 08-24-2009, 08:54 PM

Quote:

Originally Posted by Eugene-TAIWAN

Kool, let me know

For sure. I'll post up a full review with several pics after the install.

08-23-2009, 11:32 PM	#47
McLuVan Lieutenant General 304 Rep 13,114 Posts Drives: ///M3 Join Date: Jan 2008 Location: Socal~818~ iTrader: (1)	rpi gt or gintani __________________
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08-24-2009, 01:02 AM	#48
mixja Captain 50 Rep 780 Posts Drives: 2011 E90 DCT Silverstone Join Date: Jun 2008 Location: Beverly Hils, CA iTrader: (1)	Akrapovic would be a close 2nd to Gintani/RPi - you lose around 50lbs of weight as well, which is about a 1.5% increase in power to weight... Plus I'd suggest a more "civilised" exhaust note if that it was you are after...
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08-24-2009, 01:29 AM	#49
Eugene-TAIWAN Brigadier General 249 Rep 3,157 Posts Drives: E92 M3 Coupe Join Date: Jun 2009 Location: Taiwan iTrader: (4)	Wow seems like its all about RPI and Gintani. I actually think the both set ups look quite similar. __________________ Past: Gintani stage3 M3, Cayman GTS present: Porsche 993RWB, 964RS America,996 cupcar, 964 turbo 3.6,Macan Turbo,997GT2,930 turbo,i3, MINI JCW
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