exactly.

turbos need to breathe.......both intake side & exhaust

 

Enrique, the straight pipe with the cat is the "cheapest" way to go and best hp. You dont have to flash and dont need to pay for the exhaust.
I wanted to share with you some info on the sound. The car at idle and start up is how you would want a car of this magnitude to sound. At a gas station pumping gas beside a state trooper they have said nothing as would anyone in the neighborhood.
In the morning driving out short shifting again no complaints. The car is only loud at WOT.
So car sounds good from the outside and sound is controllable.
The only other thing people (the owners/drivers/passengers) complain about is the "drone" inside the cabin. Honestly at 3k rpm it is quite loud in the cabin, but again controllable and doesnt stop conversation or listening to the radio. But of course I am more tolerant because this is the set up I would use regardless of others opinions because I want the hp and performance.

Also, if and when you want to get rid of the fabspeed cat straight pipe set up when I went to sell mine to go to the straight pipes I had many people want to buy it at a good price.

Just some more thoughts

tom

 

Has anybody removed cats from stock exhaust?
Doe's it give some power more? and give error light?

 

of course we have!! Yes it will give a CEL you have lost your cats and oxygen sensor doesnt like that.
So not a great mod cause still have the heavy muffler with the back pressure.

Another thought which has also been done is the outer most baffle can be cut out from the muffler. Gives the car little more sound and no further performance. But its cheap!! I recommend getting an old stock muffler off e-bay if you want to operate on it!

 

this is not entirely true (as IllM3 points out in his post w/ real-world results) and is misunderstood.

there are 2 variables at play (and probably many more):

X - the pressure differential between intake & exhaust

Y - the exhaust speed


straight pipes will help w/ X but not Y. a pipe of some optimum length w/ some back pressure will actually increase exhaust speed. i have seen straight pipes added to other cars and actually increase lag - most likely b/c of Y.

- chuck

 

I agree with above...straight pipes can hurt low rpm power. It is all about velocity of the exhaust gases. Larger and shorter pipes slow down velocity at low rpms, ie when little gas exchange is taken place.

 

Hey buddy...took your suggestion and did some research... look what i found!

http://www.dmhperformance.com/ecutout.htm


Very tempting to go that route..... 4 year warranty too...

I'm thinking... at low rpm leave the exhuast normal..at high rpms let it open its like the M5...for power when i need it

 

i should email him and ask him how much they weight... i dont want the car weighting more then what it already does

 

very true, thermodynamics does come into play.


i guess when i am saying the best exhaust is no exhaust, i am meaning you can make more peak power with no exhaust on a turbo car.

but yes, i guess you can lose a little low end power.

 

I would go this route instead of an electric one...

http://www.atpturbo.com/root/releases/release091004.htm

 

Have to admit possibly the reason my car performs so well with just the straight pipes is because it is a track car and at redline and boost all the time.
But coming out of a second gear tight turn after heel toe down shift this thing has massive torque and acceleration, so at least in my car no problems at the low end that I can see. Also dont forget I have a light weight flywheel which may help as well.

 

Maybe a bit of confusion... I have Tom's old Fabspeed cats with straight pipes and FabSpeed can sell me the muffler as an add on (already confirmed with Joe). The Maxflow (single can design) muffler will work. It was designed to be modular.

What you can't do is attach the new Fabspeed exhaust (dual cans). Those are not backward compatible.

Hope that helps...

 

that sounds even better... no wiring...but the question now is...

i would need 2 correct?
the boost hose...i have to mod my stock one to put this one on correct?
last but not least....CEL light...will i get one ?