Wanted to ask some of you with ITA experience if you used 2" diameter from header back or larger? Where do most exit? Rear/Side?

 

2.5 here...

Dynomax "bullet race muffler" and a Glasspack, exits right before the gastank with a turndown pointed away from me.

 

I have had 2 inch ID on an ITA CRX and it is louder and raspier than the 2.5 inch that I like to run. The 2.5 was deeper toned and didn't have the higher pitch. We had trouble breaking the 102 db sound limit with a 2 inch that was designed exactly like the normal 2.5 inch we had no trouble with Sound control on. We had to run to Pep Boys and bodge on a Cherry Bomb to be able to run and this slowed the car down.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX Lee &raquo;</TD></TR><TR><TD CLASS="quote">I have had 2 inch ID on an ITA CRX and it is louder and raspier than the 2.5 inch that I like to run. The 2.5 was deeper toned and didn't have the higher pitch. We had trouble breaking the 102 db sound limit with a 2 inch that was designed exactly like the normal 2.5 inch we had no trouble with Sound control on. We had to run to Pep Boys and bodge on a Cherry Bomb to be able to run and this slowed the car down.</TD></TR></TABLE>

I wonder if my setup is slowing my car down....something surely is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jisu009 &raquo;</TD></TR><TR><TD CLASS="quote">
I wonder if my setup is slowing my car down....something surely is. </TD></TR></TABLE>

If you get a chance, try the bullet only as 2.5 and a Dynomax bullet turned down before the tank has been my system on several cars.

 

My system is actually set up so I can remove the glasspack and I already have a section of straight 2.5 to run in it's place.....

Actually I tried the Dynomax bullet style first and it seemed WAY to loud, so I added the glasspack.

Lee- what db. does just the bullet system usually equate to?

 

I wonder what this would sound like

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jisu009 &raquo;</TD></TR><TR><TD CLASS="quote">
Lee- what db. does just the bullet system usually equate to?</TD></TR></TABLE>

Usually 96-100 depending on atmospheric conditions. It is bloody loud but it is the fastest that I have found so far but no dyno backup.

 

Mine is set up after the header with 2.5" flex pipe and then 2.5" piping to a Dynomax bullet and then 2.5" all the way to the 90 degree bend in the exhaust tunnel and it stops there with a turndown aimed outward passenger side aiming following the tunnel if you can imagine that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX Lee &raquo;</TD></TR><TR><TD CLASS="quote">
Usually 96-100 depending on atmospheric conditions. It is bloody loud but it is the fastest that I have found so far but no dyno backup. </TD></TR></TABLE>

103 is the limit at most of the tracks I race @...but I am pretty sure there are a couple of tracks that are 96ish db.

Maybe I will give it a try next weekend @ Pacific Raceway.....

 

That was 101db.. I wish the end piece had been mandral bent..

I attached it with a clamp so i could angle it away from sensors!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Want2race &raquo;</TD></TR><TR><TD CLASS="quote">
</TD></TR></TABLE>

Looks exactly like mine but with a rounded end bullet can and I flare the header end tubing for a slip fit held on by springs isntead of a hard mounted flange to make it breakaway.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX Lee &raquo;</TD></TR><TR><TD CLASS="quote">

Looks exactly like mine but with a rounded end bullet can and I flare the header end tubing for a slip fit held on by springs isntead of a hard mounted flange to make it breakaway. </TD></TR></TABLE>

I considered that but it came down to - The muffler was the only thing I could find to work for sure in the price I wanted to pay (sub$100) and the hardmount would save weight and if it was torqued forwards it would be OK because I used hangers with enough give to do so!


That mufflers the maximum in terms of roundness that you could run! It was a good 1" off the ground and tucked right up against the shift linkages!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Want2race &raquo;</TD></TR><TR><TD CLASS="quote">
The muffler was the only thing I could find to work for sure in the price I wanted to pay (sub$100)
</TD></TR></TABLE>

I think I paid about $30 for the Dynomax from Summit Racing.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Want2race &raquo;</TD></TR><TR><TD CLASS="quote">
the hardmount would save weight and if it was torqued forwards it would be OK because I used hangers with enough give to do so!
</TD></TR></TABLE>

The system that I use would be lighter than the flanges on each the header and pipe. I weld on four small hex buts and use two generic 50 cent hardware springs then two of the rubber Honda hangers. My pipe does have a cross rod to pick up the Honda hangers which come from the stock mounts on the shell. Weight wasn't that much concern for me although it is light and simple, having it a clean system that can shear off if snagged hard on a berm (been there, snagged that) and not trash my expensive header. After the session, just go see the corner worked and get your exhaust back and add another $1 worth of springs.

The important thing is to get big bore, short pipe, low restriction and stay under noise limits.

 

Looks just like mine as well except instead of the flange I have a flex pipe there and slip fit with clamps for connections and a bullet muffler. My "turn-down" is angled the same as as yours. Does yours follow the exhaust tunnel all the way back to the 90 bend and then stop?