Ocelot

Ok, I always looked at these threads asking everyone what they would do for their exhaust and thought to myself "its their car, why not choose it themselves", but now that i'm thinking about spending some $$, its becoming clear why there are so many of these threads. Anyways, i'm still going crazy over the decision between these three exhausts:

- Bonez 2.5" Downpipe and High Flow Cat
- Racing Beat 3" Downpipe and Presilencer
- Racing Beat 2.5" Downpipe and Presilencer

The problem with choosing isn't just a matter of money for that part or performance it will give me, its all the other little crap that goes along with each choice. Here's each scenario, and each one has some questions inside the description, so please try and answer them as best as you can, thanks for taking so much time in helping me out to all of you who have kept responding to my countless threads. I have a few subcategory type questions which will get me a better idea of how much total money each setup will cost if I do it the RIGHT way.

Bonez 2.5" Downpipe and High Flow Cat
Ok, originally I was going to get this setup, because I liked the sound of it, and I wanted to see some decent performance, but still pass emissions. Somewhere along the line I decided that emissions weren't going to be a problem, and I have a place that will pass my inspection with no emissions testing. However, i'm also a bit worried about having my car smell like gas 24/7. I'd like to not have people who drive behind me hate me because i'm making them not be able to breath or anything.

Questions
- Ported Wastegate - Up to stock flapper or past? If past, how much?
- Fuel Upgrades - Will a new fuel pump be overkill for this?
- S-AFC - If I needed a fuel pump for this, how necessary is it for a SAFC to be included in the setup?
- Performance - What performance will I see compared to the other two choices?


Racing Beat 2.5" Downpipe and Presilencer
Originally after deciding to not care about emissions, I looked into the 2.5" dp+ps combo. I wasn't sure about whether or not having no cat anymore would require a new fuel pump and possibly S-AFC with it.

Questions
- Ported Wastegate - Up to stock flapper or past? If past, how much?
- Fuel Upgrades - Will a new fuel pump be overkill for this?
- S-AFC - If I needed a fuel pump for this, how necessary is it for a SAFC to be included in the setup?
- Performance - What performance will I see compared to the other two choices?
- Sound - Does anyone know how this setup will sound with the stock catback? I've heard about stock mufflers with higher flowing precatback setups will be a bit wierd, but I dont want it to be too loud or odd sounding.
- Smell - Does anyone with this setup think the smell of gas will get to you after a while?

As for the 3" system, my questions are basically the same as the 2.5" system, but I was wondering how much more performance you actually get with the 1/2" upgrade, and is a bigger wastegate port necessary?

When it comes down to it, my primary concerns are still fuel upgrades and wastegate porting, as well as max performance. The smell, sound, and cost play smaller parts, but don't concern me as much as possibly ******* up my engine, so I can take those into consideration last.

Basically, at what point is a new fuel pump necessary and safe? I've heard that it is better to run rich with a new fuel pump, and the S-AFC isn't absolutely necessary, but somewhat suggested. I've also heard that running that rich is overkill depending on the combo of parts, and that its safe to do a setup like this without any fuel upgrades. As for the wastegate, I hear bigger is better, but how big? I will probably be having someone do the porting for me, so I need to give them some actual numbers to work with. Thanks for all the help, I hope some of you are willing ot read through all this ****, heh


- Brian

pontious

Well, I do not know a lot about what you should choose. I will tell you that I have a RB Header and Presilencer going to basically stock mufflers. it sounds ok, except for what I call a ZINGing sound at certain RPM ranges under WOT. I have been trying to figure out how to make that go away.

The car doesn't have a bad smell in my opinion, more oily smelling than exhaust. Maybe my MOP is over doing itself

Also, do you have an S4 or an S5? I know that the S4 uses a tap of the split air pipe to actuate the auxilary ports, so if you have an S4 you will need that coming off a presilencer or whatever. Either that or you will need to rig up something else. If you have an S5 I think you can totaly disregarde what I just said

Judging from your number of posts you probably already knew this...

neptuneRX

I have that setup right now, works well. Not too loud, and not soft either... and as far as the gas smell, dunno I only get heavy exaust coming out right when I start the car, after that it looks clean. Goodluck.

Templeswain

My only input is that if you get the header and silencer, get some muffs to go with.

When I put my header and p-silencer on my s5 with the stock mufflers it sounded so obnoxious.....I don't think the stock mufflers can handle the output.

It was like a rotary rattle harley......A friend of mine was riding with me and we went to get something to eat. We pulled into the lot, and people were waiting outside in a line to the drycleaners were all looking at me....and they weren't like,"hey nice car".....

Scott 89t2

the 3" downpipe and presilencer won't bolt up to anything execpt the rest of the RB 3" system. you'd have to custom fab something up if you only bought the DP and presilencer.

Ocelot

I'm not doing the header, just a downpipe and presilencer

Ocelot

The 2.5" one would fit in fine though right?

Templeswain

Opps. sorry. I meant downpipe.

Infini IV

The 3inch system will bring on boost and full boost quicker than the 2.5inch system will. However, it will also be louder, most noticeably at idle. If you are using the stock intake and stock TID, then you shouldn't need any fuel mods. If you were accompanying the exhaust mods with intake mods, then I would go ahead and get the Walbro. With just the Walbro, you won't run too rich as to bog and require you to get a fuel controller.

Snrub

iTrader: (1)

FCs are smelly cars, I'm not convinced that my car is any stinkier without a cat then it was with a cat. I've asked people driving behind me what they thought and they say it's not that bad. I've had cops driving directly behind me and they didn't seem to mind it too much.

You're profile says you're "looking @ a '89". I'm running a full 2.5" single on a S4 with a 2-2.25 midpipe. I believe my typical peak is about 7psi (but the silly car thinks it should be hitting fuel cut). The odd time it seems to boost to 8psi. I would guess that with a S5 and its larger wastegate that you'd be fine boost wise with a similar scenerio. What are you thinking for your catback (stock)?

With my car the most dramatic change with doing this kind of exhaust was the low-mid range power (torque if you want to be trendy). The boost comes on ealier and a substantially greater amount. It's been suggested by some that in this kind of scenerio the fuel concern can be before 3800rpms because the ECU does not drive primary injectors as hard as they are capable of. I can see why they say this. Again, for an S5 this is probably less of an issue.

ilike2eatricers

I think the RB presilencer and downpipe made my car quieter than it was before with my 3 inch corksport dp and bonez high flow cat BUT then again it could just be my RB mufflers helping making it more quiet at idle and your catback making your car louder at idle.

I say go RB all the way.

Wankel7

If you do real tuning with your new setup the smell should not be that bad. When I mean real tuning that would be with a wideband or on the road. No autometer blinky lights.

James

Ocelot

I plan to eventually get a fuel controller and dyno tune, but its sort of an "as the money comes in" process. I should mention that I already have an A'pexi intake. So even if I go with the Bonez system, the fact that I have the intake also should lead me to having a fuel pump? I'm a bit worried the RB straight through will sound like crap with stock catback. I plan to eventually go with the racing beat catback, but again, that might be a bit down the road.

Ocelot

Gah, i've decided to suck it up and save for a Racing Beat Turboback. So what kind of fuel mods and porting would be needed for this setup along with the A'pexi intake?

fc3seeker

FCD
Porting your wastegate, thats for sure!
Walbro wouldnt hurt and rewiring the Fuel pump is suggested.

91DropTop

If you can find a full 3inch RE-Amemeiya dual exaust I highly recommend it. I just got mine on my car and it sounds BADASS. Sounds much better than the racing beat 2.5 inch and the falanges are all 4 bolt so you will never have any leaks.
Good luck
Laters

fc3seeker

any vids/sound clips of the RE-Amemeiya dual exaust ?