We all know it will look retarded unless one cutout is filled.
But, besides that what are the positives and negetives of going single outlet exhausts?

I'm considering do a aluminum straght pipe from the resonator back to save weight if It's not going to hurt performance.



My issue is I want to redo after the resonator because the guy that made my exhaust left in the stock Y at the rear and my whole exhaust is 2.5 in front of the Y and 2.25 pipes off the Y but ,with the stock 1 7/8" Y ,something needs to be done because I'm sure that's hurting performance.

 

"BONE STOCK: Is how I roll" - No it's not.

I was wondering the same thing though because I'd rather have a straight 2.5 from cat-res-mufflers, but if it's hurting performance than I don't think it's worth it. Plus having a straight thru made would probably be cheaper and easier to piece than something like that ATLP which I want so much. BTW I just got DC Headers today!!! and XLR8 HFC is shipped and on the way. I thought about it but for now I'm just sticking with stock exhaust because the options are so limited and the synopsis on the stock exhaust is that it is already very efficient. So in my case further information on this issue from fellow members would be very beneficial also.

 

Considering it splits into 2 and isn't a true dual exhaust, I would think looks would be the only benefit.

 

Keep an ear out for rasp after installing the new generation XLR8 HFC while utilizing the stock mufflers. Hopefully there will be none.

I had rasp with the first generation XLR8 HFC, when I replaced the bottleneck OEM cat, while using the stock mufflers. I also have the CT b-pipe, so that may have had an influence. I negated the rasp by installing the CT axle back mufflers, thanks to brian6speed above. Besides, my OEM mufflers had 120K+ and were due for replacement.

Sorry for thread jack, RP.

 

if u are looking for performance. as long as u don't have the exhaust sides of the motor (IE a custom header set-up) then u will get more power using a single pipe. the less bends, the the more direct route, will equate to more flow and likely more power. the coin. but on the other side of the coin. for what u get.. i would not do it.. i love the dual exhaust look. i love the sound. i could not ever wanna change it.. i love my ct cans.. bought em new. and would never sell them LOL

 

So maybe you can do a single exhaust but have a dummy can in place so it fills the gap.
I'll keep an ear out for the rasp, will header wrap around the HFC reduce rasp if it's too audible?

 

I am against a dummy muffler, I would prefer the empty cutout. I would just have a bodyshop fiberglass etc one of the openings.

 

What are symptoms of bad mufflers anyways? I got 175,000 miles. I've noticed during moderate acceleration that the exhaust seems to be a little raspy recently (still stock exhaust). I've never changed the cans yet. I just dumped all this money into the headers and hfc and I really don't want to buy new mufflers.

edit: also sorry for thread jack but since we're on the topic. I'd agree that a dummy muffler might not be a great idea.

 

Precisely, if you are starting to notice it (rasp) during moderate acceleration with the OEM's now, once the HFC is installed it may become more noticeable. Not trying to stir things up for you, but in the process of experimentation, unforeseen circumstances arise. Keep an eye out in the BM for a set of axle-backs, they do surface occationally.

My old OEM's sounded fine at idle; however, when I would pulled out from a stop light, while going deep into the powerband, the rasp would become quite evident. Though, I do have quite a bit more volume flowing through.

In regards to RP's post, it would be strange to look at a V6 Acura/Honda from behind with a single exhaust cutout; however, if the weight loss vs. the HP cost benefit is there, then to each his own.

Good Luck.

 

DC headers outlet inner diameter is only 2". Going larger than that for anything after the headers will gain you nothing....

 

^^^ Good to know.

 

Rich, you definitely need to upgrade your Ypipe. I'm not sure how much it's affecting your power considering it's so far back in the exhaust stream, but it definitely isn't helping. Why not just do a 3" cutout? At this point, I'd suggest a 3" collector from the downpipe to catback and do a 3" cutout right off the collector. That way you can be somewhat 'tame' with your current catback and beast at the track.

 

I totally agree. a cutout would solve that. Or you can extend the cutout to the Y so that way you can run single or dual best of both worlds IMO

 

A single exhaust will be best for power and weight. Noise will be an issue, but I suggest a 3" exhaust (from the header back). I do not recommend running aluminum though.

 

Thats not true at all. Header pipe dia is very critical in cyl scavenging. Going to large there will reduce power. What happens after the headers as far as pipe dia typically a increase in dia is needed to gain hp. Going to large though will reduce tq. I have dual 2 1/4 pipes from the header back and there is a definite increase in power, especially in the top end (gained 2mph in the 1/4 with it)
No it isnt

 

Lol. I just installed my DC Headers with XLR8 HFC. I love the combination. The sound and gains are dope too. These are with a stock exhaust. Maybe a matching 2.5 from the cat back in the future, but for now, it's not worth the money.

 

If the dc headers are like my comptech, you can shave/grind down that lip that holds the compression ring gasket. Then you just use a normal crush gasket. It will open up the outlet inner diameter by a bit. I'd say .25-.5 of an inch.

 

The dc headers are the same with the compression ring gasket being smaller than the pipe diameter. Next time I take my header off Im going to do this.

 

After some thought I'm considering a single exhaust. Any reason or negatives to using 2.5" piping?

 

instead of 2.25 or is that what we have now ?

 

3inch single exhaust would be best

 

Overkill. Going to lose torque as others have said and see basically no increase in HP vs a smaller diameter like 2 1/4".

 

if ur mufflers are going.. car will sound like a g35.. more drone as opposed to a nice vrm all the time. mine were screwed the hole time i owned the car till i got ct mufflers. i only recognized they were fuked when i removed them and saw holes in each of them facing the undercarriage which is why i never saw them..

my guess is 20% of the cl mufflers will have that issue.. especially if u live in the northern states and canada where they salt.

 

Nope, 2.5" sounds great, and is a nice step up from 2.25"

 

You cant just say 3" is overkill it matters on the setup and what the car will be used for.

Ideally 2.5-3" is where you want to be.

 

OK. For 95% of the CL-S' here on the site it is.

 

I know thus is an old thread, but I'm stuck between keeping my dual cans or doing a full single 3". If I keep the duals the midpipe will be 3".

With the lip kit, there are no exhaust cutouts so I don't think it would look too bad. But I'm not sure if I'll like the looks of the single as much.

 

Keep it dual. It looks better

 

ya I'm thinking the same

 

I would say dual unless you are as crazy as me towards weight loss. One muffler will make it look more like a honda than an acura.

I even want to keep it dual for looks but my addiction will talk me out of it. I am already looking at what I can remove from the focus.

 

Ok, dual it is. I had the same feelings with the dual.

 

I have decided to go single, but am having a hard time deciding on resonators/mufflers. King motorsports says they have vibrant and magnaflow mufflers they would use on my exhaust build. I am just not sure if I want to use those. I like the offers from Burns stainless, but when I mentioned them Scott at king motorsports didn't seem to want to use them. Maybe the borla xr-1 race muffler.

Then it is whether I go all the way to the rear bumper or make a turn down. I do want to make/add a diffuser later on. I could just use muffler closer to the front and just leave the rear by bumper straight pipe.

So many options and I need to decide soon.

 

I couldn't agree MORE with Progression. I loved my 3" crush bent single exhaust ( there was only 1 bend about 25 degrees) made great power.