SKELITOR117

iTrader: (3)

I have a Custom 1992 Camaro RS that's been lowered. Is there still a practical way to have dual exhaust? I know single exhaust systems are popular but they look to restrictive with only a 3" diameter center pipe, as apposed to say two 2 1/2" pipes, and they're more expensive. If I get a single back kit which is the best? Tips, suggestions, or comments anyone?

camaronewbie

I've not seen a lowered 3rd gen with dual pipes yet that does not rub and scrape exhaust on every driveway, speed bump, etc. I'd pass on the dual - there's just no place to put the second pipe.

Besides - your stock single exhaust Intermediary pipe is plenty for that 305 - I'm running stock single exhaust with my 350 and no restrictions. When you get rid of the restrictive heads, intake, etc. then worry if you have enough pipe.

pwdbychevy

Mine doesn't rub.

https://www.thirdgen.org/forums/exha...-own-true.html

SKELITOR117

iTrader: (3)

Batman wishes he had this car

UnderCover89TBI

iTrader: (25)

Yeah in most cases its going to rub. do you want to pay an exhaust shop a huge amount of money to make sure it doesnt rub, to only have it rub and they go oh well...for your 305. trust me the single 3 inch is fine. true 2.5 duals would be overkill for that. dual 2.25 inch wouldnt be bad but still going to be hard regardless. if I was not in california and my car wasnt a DD i'd run true duals because i like them better. but since im here im not

SKELITOR117

iTrader: (3)

Yah, I'm lookin to get some Hooker Headers and replace the throttle body with a GM performance throttle body, which kit/brand in Yalls opinion would go best with this combo? I want a good mean sound as well.

pwdbychevy

Lol

Pocket

iTrader: (24)

Stick with a single 3", your 305 will never be "restricted" by it. LS1s with twice the power of the LO3 still use a 3" catback with success

Cost/difficulty of a dual 2.5" is beyond the benefits of using a common single 3"

SKELITOR117

iTrader: (3)

Yah. I'm lookin to put a 350hp 350ci crate engine in it later on. that 10hp more than double the stock hp mine has. which is 170hp when new. 255 lbs tq though

Pocket

iTrader: (24)

Still not going to choke it down

SKELITOR117

iTrader: (3)

I was looking ar some kits and they seem way more expensive that dual exhaust kits. Why?

//<86TA>\\

iTrader: (14)

because there are NO good dual kits for the 3rd gen, for that matter, there is only 1 that i know of.. You have to make it yourself or use the craptastic dynomax one.

stick with a single 3. No headache, tuckes up well and will support a lot of power.

SKELITOR117

iTrader: (3)

I dont think there are any at all. But I was looking at dual kits for other camaros and they are like $300 WITH the mufflers and the headers, while single kits WITHOUT the headers or Y pipe are like $600

UnderCover89TBI

iTrader: (25)

if your car is a 305 tbi then you do not to change teh throttle body its wasting money.

mmadden55

Ok here is the secret. Don't go over the axle. Use the Hooker headers matching Y pipe and cut before the merge. Have two pipes made to run parallel to each other down the single pipe route. Use glass packs for mufflers. Dump them out the side before the passenger side rear tire.

Alternative is to use corvette style sidepipes.

AutoRoc

iTrader: (1)

3" single but install a 4" muffler out back. 3" pipe can support big power but a 3" "real" muffler can be restrictive. Go 4" on The muffler.

I like the smoothness of a single exhaust.

scholtmj

iTrader: (3)

305 TPI, Hooker long tubes, 2.5" pipe w/flowmasters - spark show, but worth it for the sound.

el_muerte

Some maths for you to put single 3" vs dual 2½" in perspective:

Area of circle = ¼πd²
Area of 3" single = ¼ * 3.1416 * 3² = 7.07in²
Area of 2½" dual = 2(¼ * 3.1416 * 2.5²) = 9.82in²

This means a single 3" exhaust is only 28% smaller than a dual 2½" exhaust, and that doesn't take friction losses due to the much larger surface area of the duals into account.

In theory, an engine would need to make ~365 hp before it begins to encounter restriction in a 3" exhaust pipe. In practice, however, that number changes based on the pipe's inside surface smoothness, number and positions of bends, exhaust gas temperature, and a number of additional factors that are difficult to estimate or control.

SKELITOR117

iTrader: (3)

That is the single coolest reply I have ever gotten about anything. I am saving the email alert I got for this.

five7kid

iTrader: (14)

Except it isn't quite correct. Pipe diameter is OD, so you need to subtract 2x the wall thickness to get the ID, then perform your area calculation using the ID for "d".

SKELITOR117

iTrader: (3)

I see. Still though.

el_muerte

Forgot that bit. Updated areas based on 16-gauge tubing (0.0625" wall thickness) are:

6.49in² for 3" exhaust
8.86in² for dual 2½" exhaust

Making the difference slightly smaller at 26.8%.

11ellswray

iTrader: (1)

holy suspension!
how much power did you pick up with the long tubes? and can you really feel it?

UnderCover89TBI

iTrader: (25)

I'd like to have long tubes but id imagine the power difference is minimal at best 10-15 hp, probably 20 ft lbs or so

SKELITOR117

iTrader: (3)

How much horse and torque would I stand to gain if I got a better single pipe exhaust and some new performance headers?

InfernalVortex

iTrader: (4)

The only way to make a big exhaust work is a mufflex setup. Period.

You can get a T56 and a notched crossmember like I did, but that's only if you have a T56.

Sutton

I am installing my T56 next week. Then I am onto my exhaust. Just woundering if you could post a pick of your setup Infernalvortex.

mw66nova

iTrader: (13)

really? you having issues with yours? you got my number if we need to fix something.

dthela

87 Z with ZZ430 (430HP) I have frame stiffeners (full) so not much room at all, was thinking about sidepipes. Anyone ever seen any? Yes ot's soooo low too!

mw66nova

iTrader: (13)

yes....normally associated with single wide living