FW: [s-cars] Stebro vs. Stromung exhaust

[Cody Payne]

Scott,
	In regards to your last comment: "Bottom Line:  Audi builds darn nice turbo exhausts from the factory.  You can go "bigger", but really tough to equate that to "better""

	I think that the UrS4 had a decent heavy and very mellow exhaust that flowed pretty good via it's dual pipe nature.  However I think that if you look at the B5 A4 and B5 S4 and the performance gains you get with just an full exhaust + chip you would see that there is a lot of restriction in the OEM systems.
	Lets take a look at the numbers for the B5 S4:
		- Stage I Chip 305 HP (Get on the throttle sounds like a sand blaster)
		- Stage II Chip + Cat Back 320 HP
		- Stage III Chip + Full Exhaust and DownPipes 340 HP

	Lets take a look at the B5 A4 1.8T:
		- Stage I Chip 187 HP (Sand blaster sound)
		- Stage II Chip + Cat Back Exhaust 210 HP
		- Stage III Don't have numbers that only include DP and Cat and not a K04

	Finally the C4 UrS4/S5:
		- Stage I+ 280 HP
		- Stage II Chip + Full Exhaust?! or RS2 Manifold?!
			- I would "guesstimate" it to be around 300 HP w/ the Full Exhaust
				- Has anyone done headers only w/ stock exhaust + chip?
		- Stage III Chip + Full Exhaust + Headers HP Unknown Guess 320?
		- Stage IV RS2 + Full Exhaust 350-380HP depending on tuning
		- Stage V RS2 + Full Exhaust + FMIC 400 HP
		- Stage Hap/Mike The works... ALOT OF HP!!!

In all 3 systems above the turbo has not changed and have only decreased the resistance of the stock OEM system..and going from Stage 1 to 3 software programming has changed.  In my past experiences/ownership of the B5 (S4 and A4) going from Stage 1 to 2 the software did not usually change (MTM and ABT)

	Now "was" exhaust restriction on the C4 UrS4/S6 an issue? I don't have the numbers...and perhaps Mike P's test will put some light on the issue.  I also don't know what the MTM RS6 gains w/ the full exhaust...perhaps Fredrick can expand on this.
	What I can tell you is that when I went from my stock system to the Stromung...I noticed quicker spool up by 300 RPM to full boost via boost gauge comparo.  I also noticed that she pulled harder at the higher RPM's....

Cheers

cp


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