Keep arguing it, if you went with HUGE headers on a fairly otherwise stock motor with a cut-out you would see HP loss. BUT this won't be the issue for any of these people here.

[QUOTE=FiveOhNo]he may not have worded it correctly (as to not sound like a jerk)...but...it does cause lack of low-end power [/QUOTE]

Would you like me to go time-slip hunting and pull out my time slips from my modified 88 Iroc-z with the cut-out both CAPPED AND UN CAPPED?

I see your car is modified, I would assume you would understand this debate, but I guess I'm wrong.

[/QUOTE]

you want a little bit of back pressure...not the amount that comes stock though, hence the complete exhaust...or turndowns after the mufflers.  back pressure is basically what the engine uses to "push off" of (torque)...therefore it being needed in bottom end. with the headers and h-pipe replaced on my car i gained 24hp (measured with the g-tech pro...average of 5 runs...198hp STOCK -> 222hp after the exhaust...just to show you the gains of full exhaust)

ps-> haven't had time...or desire to run it open headers and check, but i can't see it gaining more than 24hp...or else why would people waste money on exhaust systems?

"why would people waste money on exhaust systems?"  To keep their car street legal

"can someone say dan02gt got :owned:"  i can't say that he has...

"why would people waste money on exhaust systems?"  To keep their car street legal

"can someone say dan02gt got :owned:"  i can't say that he has...

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what about the states like good ol' south carolina...no inspection, cops don't care about loud exhaust...yet pretty much everybody runs exhaust systems, EXCEPT PEOPLE AT THE DRAG STRIP WITH HI-PO ENGINES.

[QUOTE=FiveOhNo]ps-> haven't had time...or desire to run it open headers and check, but i can't see it gaining more than 24hp...or else why would people waste money on exhaust systems?[/QUOTE]

Laws, my friend. If I could run open headers all day long, bet your ass I would. And I would take two identical cars, do the same mods but put a cut-out infront of that cat...we can both take a seat behind the wheels and you'll be a believer when we take that ride to the dyno, or if I get impatient and decide to show you first hand from a set of lights.

Laws, my friend. If I could run open headers all day long, bet your ass I would. And I would take two identical cars, do the same mods but put a cut-out infront of that cat...we can both take a seat behind the wheels and you'll be a believer when we take that ride to the dyno, or if I get impatient and decide to show you first hand from a set of lights.

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baaahahaha...you know...i'm getting scared......laws?  i like how you seemed to almost "skim over", as you said in a different topic, the part about saying people in SC DON'T CARE ABOUT EXHAUST LAWS!  the only way to get in trouble is to run open header on a 4-banger (i got a warning with my crx on my way to getting a downpipe installed for a turbo setup )

"why would people waste money on exhaust systems?"

That says NOTHING about 'SC'.

Dan didn't get owned, sorry. 

Dan is right and so is everyone else.  He's the deal.  Backpressure aids in the prodution of torque.  torque is what gets you going, HP is what makes you fast in 1/4.  By running a full exhaust this helps keep the torque at a level where people are using it.  We don't drive around at 5k on the tach.  We run around 2k. The backpressure aids in throttle repsonse and instant acceleration.  By dumping the exhaust through the use of cut outs elimnates backpressure almost completely.  This means a reduction of torque and poor throttle reponse. But, it increases the top end breathing ability rasing HP, leading to a faster ET.  Running cutout on the street all the time not a good idea because of the throttle reponse. Running a cutout on the strip, much better.  The use of  a Q tech cutout is the best all around option.  you can keep it shut for you launches and open it up as you go down track aiding in the ET.