Janus

Well the time has come for me to get a cat-back. I really wanna save for a Racing Beat, but at the same time I also really wanna go single. I know it would be possible to do this- just have to buy the muffler and get a pipe to go between my pre-silencer and that- but at the same time I'm wondering if its something I'd really want to do.

Opinions? Anyone tried this before? Would it be way louder than I'd want? Would there be a performance drop from maybe restricted airflow?

1987RX7guy

iTrader: (3)

I would say you'd have to run a 80mm pre-silencer as a rear muffler to not lose the performance of two 2" n/a cans or two 2.5" turbo cans.

Janus

So basically I'm looking at a performance loss unless I get a good sized exit muffler? Any chance someone knows a middle ground here? A muffler sized somewhere between RB and the Apexi N1/GT size that doesn't have any/very little drop in performace? Thats really what I'm looking for. I already know Corksport/SS Autochrome are somewhere in that area but are there any others? Apologies if this is venturing into well covered territory- feel free to just point me in the right direction if it is...

j200pruf

iTrader: (4)

Well almost all of the RB exhaust is 2.5" so just cap off the exhaust with 1 2.5" turbo can from RB.

1987RX7guy

iTrader: (3)

RB has an 80mm Silencer. Its off their 'turboback' system. Pick that up individually and use a piping setup that shifts size up to 3.15"


Santiago

InGroundEffect

Right now I have the RB Street Headers going into the factory Cat housing then splitting into the HKS Cat back exhuast.

I am about to order the parts to do a single exhaust back. I have the flange and gasket on the way to mate up to the header.

What I am going to order is a Dynomax Muffler 2.5 in and out straight though muffler to go in the factory Cat location. Then a Magnaflow 2.5 in and out straight through muffler to go in the factory muffler location on the passenger side. Use standard 2.5 muffler tubing. Total cost in parts will be around $120.00 I have a friend with a Welder and Pipe bender. Once that is done I will try and Dyno the car again and see if it making more power.

Last time it made ~150 HP at the wheels with the current setup.

Janus

Ah... I gotcha now, so just get the pre-silencer and cut off one of the flanges and voila insto-muffler? Yeah I suppose I could do that, but then looking at the prices its going to probably come out to about the same or more than a Corksport. But it would be what I'm looking for I suppose. So has anyone ever done this before or are you just suggesting it to show me the impossibility of the single RB exhaust?

oakback

I did something similar. RB header to rb presilencer, 2.5" pipe to a magnaflow 2.5" in/out straight through (7" can). Good increase from stock catback, and I like the sound.

evileagle

iTrader: (1)

AHHH!

Would you people stop implying that ours and SSAC are the same thing?!

I'm gonna go nuts here.


But on another note, you could always just do what you were saying before about cutting a flange off one side of the RB 3" presilencer. Just put it earlier in the exhaust path and just run some pipes with a decent looking tip out the back.

Janus

Lol! SORRY! Thats not what I meant I swear! I just meant both are around the same size as far as muffler size goes.

Hmmm alright let me start from the beginning here- so far I have a RB downpipe and pre-silencer (both 2.5") and then its stock from back there. I have an exhaust leak (read: hole) in my y-pipe so I figured its time to get a cat-back. I would like to go single and I'm kind of partial to the Racing Beat mufflers so I was thinking of going with one of those (I guess the 2.5" turbo one) and then having a pipe fabbed between that and my pre-silencer. The catch is I really don't want to lose any performance (preferbly gain as much as possible). So would that set up cause me to lose some over other systems or what?

I apologize if I'm being difficult, just trying to learn about this stuff...

Janus

Alright let me try rephrasing this one more time- if I go single, does an N/A need the extra flow that a 3"(+) exhaust system offers? Or would I be ok with a 2.5" system all the way? Would the 2.5" offer less of a gain in performance? And last question, would I need the bigger system later if I was to say 1/3 bridge or otherwise port my engine?

Again feel free to just point me in the right direction, I searched a little for this stuff but most of the threads I saw weren't really on this subject...

Jager

iTrader: (10)

You wouldn't need more then 2.5" on a nearly stock NA (Even 3" would hardly be needed). I personally think the cat-back would look gay with just one RB muffler. If someone could adopt a dual-tip one for single exit, maybe it wouldn't look to bad.

Maybe just buy the full system and be done with it?