Need Mazdaspeed3 Advice please
im thinking of getting the ultimate racing downpipe and test pipe but id need atleast one cat orelse i doubt ill pass inspection. what would be the smarter choice, 3" catless dp with a 3" high flow cat or a 3" high flow cat dp with a tp
If you definitely want to replace the stock BPV the Forge BPV is great bang-for-the-buck and used by many MS3 owners. Blue + 2 FTW.
would it be a good thing replacing it or would my best bet be to leave the stock one
FrequentFlyer is right that the stock BPV does a pretty damn good job, but I noticed slightly smoother and more consistent performance with my Forge BPV. It's not night-and-day in terms of performance, though it is substantially louder (which you said you wanted).
As an aside: I would highly recommend installing the mods that you want to get one at a time so that you can evaluate the effect that each one has. You might find that adding a DP gives you exactly the sound you want without a TP or RP, something that would have missed if you replaced everything all at once.
Also, if you're definitely getting the Cobb SRI, definitely get the Cobb TIP, it's absolutely fantastic (you could probably install these two mods together though (crazy)).
As an aside: I would highly recommend installing the mods that you want to get one at a time so that you can evaluate the effect that each one has. You might find that adding a DP gives you exactly the sound you want without a TP or RP, something that would have missed if you replaced everything all at once.
Also, if you're definitely getting the Cobb SRI, definitely get the Cobb TIP, it's absolutely fantastic (you could probably install these two mods together though (crazy)).
Solid advice above to spend OP's money on a good SRI or CAI intake, to keep the stock BPV or if he absolutely HAS to get an aftermarket one to make sure it is run in full recirc. Vent to atmosphere is for ricer s**** and giggles on MAF sensor controlled ECU's like on our engine. It creates drivability issues and can't possibly do anything but harm performance.
As to exhaust, I can only speak for Gen 1 version. On that model, the stock CBE flows better than the maximum output rate of the K04 turbo, so there are no gains from spending big bucks on an aftermarket CBE. It only changes sound, but adds no power.
The restrictions are not in the CBE for us, but upstream in the stock downpipe and the two low flow cats. I know there are catted and catless dp/rp options now for Gen 2 and they should be considered as they will really build power.
Check with Gen 2 owners re: CBE, but my guess is that the Gen 2 CBE also flows better than the turbo output and little or no power gains would be made until you get to power levels above 300 whp, which typically means bigger turbo.
As to exhaust, I can only speak for Gen 1 version. On that model, the stock CBE flows better than the maximum output rate of the K04 turbo, so there are no gains from spending big bucks on an aftermarket CBE. It only changes sound, but adds no power.
The restrictions are not in the CBE for us, but upstream in the stock downpipe and the two low flow cats. I know there are catted and catless dp/rp options now for Gen 2 and they should be considered as they will really build power.
Check with Gen 2 owners re: CBE, but my guess is that the Gen 2 CBE also flows better than the turbo output and little or no power gains would be made until you get to power levels above 300 whp, which typically means bigger turbo.
will do on the tip also deffinetly, thanks.
would it be a bad thing if i got a 3" catless dp and a 3" tp since they have no cats? http://www.ultimate-racing.com/Products2/Mazdaspeed3/Mazdaspeed3_Exhaust.shtml
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Bad? No...but you run the risk of boost creep.
Boost creep is when your intake and exhaust are so free flowing that they can actually overpower the internal wastegate on the stock turbo. This means more exhaust is allowed to spin the turbo than should be allowed, and the boost slowly creeps up under WOT past where you want it to stay. This can be bad, especially if you're tuned to run 15 psi, but creep up to like 19 or 20.
Boost creep is when your intake and exhaust are so free flowing that they can actually overpower the internal wastegate on the stock turbo. This means more exhaust is allowed to spin the turbo than should be allowed, and the boost slowly creeps up under WOT past where you want it to stay. This can be bad, especially if you're tuned to run 15 psi, but creep up to like 19 or 20.
would u prefer a tp with a cat or a dp with a cat or both with cats keeping in mind i wanna be loud
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TP with a cat...that's what I'm running now. Open DP with the stock test pipe. You could save some money going that route, too...just use the stock TP if you can. I'm not sure if you would notice any difference in power from the stock catted TP and an aftermarket catted TP.
u have a vid of ur car running?
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I don't think I have one with the current setup.
Here is the one I have, but it probably won't be much help. I've been meaning to take a new video...maybe I'll do that tomorrow.
http://www.youtube.com/watch?v=d4eIxPSr3_M
You can at least tell that the DP is the main sound killer. I'll make a new video tomorrow to show what my current setup sounds like. Also, those were cold starts, hence the black smoke (fuel).
Here is another one from the inside:
http://www.youtube.com/watch?v=xyrkn8ptcRI
It's not too loud from the inside. The BPV is definitely audible (not sure if that comes through on the video)...I've scared pedestrians before with it, actually. It's obviously not as loud as a full VTA BOV, but it's still pretty audible.
Here is the one I have, but it probably won't be much help. I've been meaning to take a new video...maybe I'll do that tomorrow.
http://www.youtube.com/watch?v=d4eIxPSr3_M
You can at least tell that the DP is the main sound killer. I'll make a new video tomorrow to show what my current setup sounds like. Also, those were cold starts, hence the black smoke (fuel).
Here is another one from the inside:
http://www.youtube.com/watch?v=xyrkn8ptcRI
It's not too loud from the inside. The BPV is definitely audible (not sure if that comes through on the video)...I've scared pedestrians before with it, actually. It's obviously not as loud as a full VTA BOV, but it's still pretty audible.
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Get at least one CAT, MS3s run so damn rich that exhaust is pretty nasty. Is there emissions testing in your state? I'd spend the extra few bucks also to stay legal and to avoid having to uninstall/reinstall everything each year. These reasons in addition to the boost-creep issue, which could really screw things up.
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u had a stock intake in this video?
would a downpipe with highflow cat and a testpipe be good or a catless downpipe with a highflow cat test pipe
I will have to disagree with you on this one bro, I have to say TurboSmart makes some seriously nice stuff, however you also have to maintain it, ie oiling the brass piston inside reguarly if you run it 50/50 and on top of that you can't compensate for the back firing that it causes when in 50/50 mode, I've had many discussions with TurboSmart about that 2 years ago when they initially released the 50/50 but they all told me there is just no way to "tune" out the backfire (after-fire) when not run in full recirc, unless you convert to the speed density system. I still have mine, even tho my piston seized after 20 days of running 50/50, so now I oil mine on a regular basis and 2 years later zero problems, but it is in full recirc mode.
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The first one...I think so. I can't remember 100%, but I think so. The second one, no.
I have a CP-E Cold Air Intake, RPMC Turbo inlet, CP-E FMIC, Forge BPV, Corksport catless DP, and stock TP right now
The first one...I think so. I can't remember 100%, but I think so. The second one, no.
I have a CP-E Cold Air Intake, RPMC Turbo inlet, CP-E FMIC, Forge BPV, Corksport catless DP, and stock TP right now
i reallly need to hear what your car sounds likee, if you can get a vid and let me know when u upload it please. also what made u take the cpe cai? alot of ppl get the cobb sri and how is the rpmc turbo inlet?
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I actually traded my Cobb SRI for this CPE unit. Why? Not really sure. Someone made me an offer, and I felt like it was a good one. The turbo inlet is good enough, I guess...it was really the only thing on the market when I ordered it. If I had to do it again I'd get the Cobb piece, but like I said, that wasn't even around when I got my inlet.
ahhh i see, would you get a cobb sri over a cpe cai?
