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

So, I think these are the things I need

1 Muffler
2 Piping from stock CAT to the muffler . I know that stock GSR pipe size is around 2.09". Is it one piece pipe? what is this called?

Do I need anything else? Anything to connect from the DC 4-1 header to the stock CAT ?</TD></TR></TABLE>
DC makes two 4-1 headers.one with a flange to meet the stock cat with no mods.the other is intended for the JDM cars with a 2.5" cat.if you get this one it will require you to either go with a bigger,aftermarket cat,or put a different flange on your stock cat,neither of which may be legal(or worth it).
Chris

 

So, what you all are doing with the header + exhaust set up in STS?
Iguess, I am not the first person trying to do this?

 

You are reading waaaayyy to far into this and everyone here that has been posting has been making a couple assumptions that you have some experience with Solo2 and its rules. Apparently this is not the case. In STS you are allowed to use an off the shelf aftermarket header and cat-back exhaust.

Section 14.10 B

Exhaust manifolds and headers may be replaced with alternate
units which are emissions-legal. Relocation of the oxygen sensor
on the header is permitted. Alternate oxygen sensors, including
heated types, are permitted


Section 13.10 E (Stock Class Category which carries over to Street Touring Classes)
Any part of the exhaust system beyond (downstream from) the
header/manifold or catalytic converter, if so equipped, may be
substituted provided the system meets the requirements of 3.5.
Stainless steel heat exchangers are permitted only if the physical
dimensions and configuration remain unchanged. Modifications
of any type, including additions to or removal of, the catalytic
converters, thermal reactors, or any other pollution control devices
in the exhaust system are not allowed and the system must be
operable. Replacement catalytic converters must be OE if the
vehicle has not exceeded the five-year/50,000 mile warranty period
as mandated by the EPA. Converters must be of the same type
and size and used in the same location as the original equipment
converter(s). This does not allow for a high performance unit. If
the vehicle has exceeded the five-year/50,000 mile warranty period,
replacement catalytic converters must be OE-type as per
Section 13.


Cliff Notes: You can use any header and catback exhaust you want as long as it does not change the size, shape, and location of an OE type catalytic converter.

To answer a few of your other questions, a catback exhause will include a midpipe/B-pipe (depending on your car) and the axle back pipe attached to the muffler. Off the shelf units usually come in these two pieces.

Now seeing that the small cat in a Honda is usually the big bottleneck of the exhaust system, you will see minimal gains between different aftermarket pieces. Find some soundclips of the units that you like aesthetically/ in your price range and then go from there.

Conversation over

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wacked2882 &raquo;</TD></TR><TR><TD CLASS="quote"> Converters must be of the same type
and size and used in the same location as the original equipment
converter(s). This does not allow for a high performance unit. If
the vehicle has exceeded the five-year/50,000 mile warranty period,
replacement catalytic converters must be OE-type as per
Section 13.
</TD></TR></TABLE>
Thanks for posting the rules. I wish I could agree with you so that one can for most of the after market exhaust systems available. Rule also states that
"This does not allow for a high performance unit".

In my opinion and with the limited knowledge I have from
fellow STS guys, this prevents one from going for an after market cat back system which is supposed to be high performance than OE.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schumi &raquo;</TD></TR><TR><TD CLASS="quote">
Thanks for posting the rules. I wish I could agree with you so that one can for most of the after market exhaust systems available. Rule also states that
"This does not allow for a high performance unit".

In my opinion and with the limited knowledge I have from
fellow STS guys, this prevents one from going for an after market cat back system which is supposed to be high performance than OE.</TD></TR></TABLE>
what you quoted only pertains to the cat.it just states that you must keep the stock cat.if it has been replaced,it must be a stock size,OE replacement-no high performance cat is allowed.
that part has nothing to do with the actual exhaust.
Chris

 

Ok...Ok...I got it now.
Are there any 'OE type' CAT that can replace the restrictive stock CAT?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schumi &raquo;</TD></TR><TR><TD CLASS="quote">Ok...Ok...I got it now.
Are there any 'OE type' CAT that can replace the restrictive stock CAT?</TD></TR></TABLE>
well,the main restriction on the stock cat is the small inlet and outlet sizes-the honeycomb material is pretty much standard,so i don't think you'll pick up flow in that area with an aftermarket unit.the palce to gain any performance is from swapping from the stock size openings(like 1-7/8" i think?)up to something like 2.5".
optimally,a header with a 2.5" collector to a 2.5" inlet/outlet cat to a 2.5" exhaust would probably be the ideal setup.
by reading the rule stated above,i'd say an aftermarket cat with bigger inlet/outlets IS NOT legal.the only thing that would be legal is a direct replacement that is identical in shape and size.only gain to be had there is if your stock cat is partially clogged.
a good header with a stock size collector flange,an OEM(or OEM style)cat in good condition and a good cat back aftermarket exhaust is your best bet by those rules.
NOW,there is the variable of using an OEM(say for instance,JDM ITR or NSX)cat that comes from the factory with bigger inlet/outlets.you are abiding by the rules as you're using an OEM cat,but since it isn't factory installed on your particular car,i can't imagine it would pass.
i say leave the stock cat there and work around it.if it needs replacing,replace it with an exact copy.the small gain that may be had by trying to bend the rules isn't worth a protest and the associated trouble/expense of swapping back over to stock stuff.
Chris