Cabin noise with CAI or SRI?

[gtlaw]

I guess I'll just buy a Forge BPV then. Assuming it won't void my warranty. I never hear whistling... maybe a mild whistling at times.

well it could void the warranty, but its so easy to remove that the dealer never has to see it.

with the stock box running the yellow spring its noticeable, but not loud

 

[lestat13]

I thought about it. If the car died on the road and I had to invoke Mazda's roadside assistance, how the hell would I get it swapped before going to the dealer?

Also, if I do decide to do this, I'm not going to talk about it on the internet. Oh who am I kidding, it'll probably end up in my sig!

My plan, in a worst case senario, have it towed home or to the nearest performance shop (or someone who will do downpipe) have them swap it, and then have it towed independently to mazda. Hell, $200-$300 for 2 tows is a lot cheaper than 10k for an engine. That downpipe is the only thing I haven't done on my car myself, but after hearing about it, it's something I am not comfortable attempting and risk something like stripping my turbo's threads

Intake or bpv/bov is a lot easier, but even if you have the stuff at home, tow home, swap, tow back.

 

[AutoEuphoria]

I didn't notice the turbo spooling noise until after I installed the CS catless downpipe. Now I can hear it spool up a bit, but you don't hear the noise for long.

 

[gtlaw]

I thought about it. If the car died on the road and I had to invoke Mazda's roadside assistance, how the hell would I get it swapped before going to the dealer?

Also, if I do decide to do this, I'm not going to talk about it on the internet. Oh who am I kidding, it'll probably end up in my sig!

for an intake, and BPV I would go home, get them, replace them where the car died then call roadside assistance

 

[MSMS3]

I guess we've gotten a little off topic, almost stolen the thread, regarding the noise level of SRI or CAI intakes, but I'll put my two bits in on the topic and on the turbo spooling sound. I'm long winded. Bear with me!

1. I'm still running the stock intake. This is partially because I do have a K&N CAI on another non-turbo vehicle I own and it is LOUD. It's one of those big cone filters inside a three sided metal box with the top open which seal when the hood's closed. It also has a particular annoying resonation at certain engine rpm's especially at throttle positions in between light throttle and WOT that really pisses my wife off. It is annoying enough that I do switch back and forth between it and the factory airbox with a K&N drop in filter after the noise starts getting even to me.

Oh, and did I mention that the thing is LOUD? This makes me hesitant to go with an aftermarket intake despite my other mods until someone comes up with an aftermarket airbox that muffles some of the sound. On my other vehicle I ended up putting a lot of Dynamat on the sides and bottom of the the K&N "box" and the underside of the hood above the box. This helped with some of the noise but did not help the resonation which is probably due to the intake tube. The Cobb SRI might not have that issue, but will still be loud.

2. About turbo "whine": Yep, it's high pitched but not very loud. I doubt you would hear much of that with the change in intake. But I am running the TurboXS DP/RP "stealth back" combo and you can hear the spooling, just barely on acceleration and a little more clearly on deceleration. It's not particularly bothersome.

3. But the exhaust drone and increased exhaust loudness of the DP/RP did lead me to cut (yeah, I held my breath on this but it worked out great) the RP and removed a 15 inch section from the middle long enough to insert and weld in a Vibrant 3 inch Ultra Quiet resonator. That thing works! It is a straight through design with a lot of sound absorbing material inside the outer shell. Because it is straight through, there is no restriction and no poer loss. Now I can hear the engine again and the drone is gone. Nice deep mellow sound and still have the full benefits of the catless 3 inch DP/RP.

Sorry about any hijacking of the thread. CAI or SRI = LOUD. Your choice.

If factory intakes are reasonably quiet on 400-500 horse new Corvettes, high flow and noise control can exist together. I don't really care for people to hear how "fast" my car is. I'd rather have them hear quiet and see taillights getting smaller and wonder why!

 

[desperado-c]

I guess we've gotten a little off topic, almost stolen the thread, regarding the noise level of SRI or CAI intakes, but I'll put my two bits in on the topic and on the turbo spooling sound. I'm long winded. Bear with me!

1. I'm still running the stock intake. This is partially because I do have a K&N CAI on another non-turbo vehicle I own and it is LOUD. ....

Sorry about any hijacking of the thread. CAI or SRI = LOUD. Your choice.

If factory intakes are reasonably quiet on 400-500 horse new Corvettes, high flow and noise control can exist together. I don't really care for people to hear how "fast" my car is. I'd rather have them hear quiet and see taillights getting smaller and wonder why!

I agree with everything you said. If you don't want loud intake noise you definitely need a fully enclosed box on your aftermarket intake. Even that might not be enough. Come on Cobb, let's get that box designed. If and when it comes out, I'll definitely give it a try. Might have to add some dynamat to quiet it down some more.

One note on resonance, the CP-E definitely had a tinny sound. I'm thinking that one benefit of the Cobb being made of plastic might be a lack of the tinny resonance which you seem to say you can get even with a short metal tube like that in an SRI.

 

[lestat13]

I have the cobb sri and I don't have any tin sound like you are describing. Unfortunately, I have the corksport stealthback and don't get any turbo whine sounds, but that is probably from the divorced wastegate design.... sad face....

 

[Dash08]

Ugh... I really really want to hear my turbo. I want the whooosh hissss sound so badly! I'm bone stock right now.

What would be the best way to achieve this? Would the Forge BPV do this for me with the stock airbox? Or would I be better off buying a Cobb SRI?

(ricer)

Hey man, Just do what I did.
Remove the bottom of the factory airbox from the car and zip tie the filter to the top of the box. Voiala!! Instant SRI!
You'll love it. I do. I love all of my turbo sounds!
You'll hear your factory BPV as well. It's awesome!!

 

[DaleNixon]

Is that safe?

 

[Dash08]

Is that safe?

Yep.
Been running it for about a month now. No problems.
I used 4 big zip ties, joined 2 of them, and wrapped it around the top box and filter. Just make sure you've got a good seal.
Sure, it's a bit ricey, but it works well!
If you don't like it, you can still switch back. PM me with any questions.

All of these guys are right though. The sounds are loud, specially the turbo suction through the intake (over 3000 RPM). So if you don't like the noise, stay with the stock airbox.

Sorry to jack the thread. Just trying to help someone out.

 

[desperado-c]

Yep.
Been running it for about a month now. No problems.
I used 4 big zip ties, joined 2 of them, and wrapped it around the top box and filter. Just make sure you've got a good seal.
Sure, it's a bit ricey, but it works well!
If you don't like it, you can still switch back. PM me with any questions.

All of these guys are right though. The sounds are loud, specially the turbo suction through the intake (over 3000 RPM). So if you don't like the noise, stay with the stock airbox.

Sorry to jack the thread. Just trying to help someone out.

How often do you have to change your filter?

 

[hyperpm]

Well I finally have Cobb SRI and it's turbo noise/suction above 3k rpms is quite loud especially if windows down and radio off. I like the noise but hoping I don't get tired of it. Power is amazing.

 

[Dash08]

How often do you have to change your filter?

It's too soon to tell. I've had it like this for 1 month, but it's looking good. Filter element is still white. Only a few very small patches of dirt. This is still the OEM filter too.

 

[Jasnall]

I did a BPV with my stock air box...no sounds

Installed my COBB Sri...woooowhooooooo! BPV sounds great

I believe you do hear the turbo spool with an intake, But like people are saying alot of the noise is the sound of air being sucked into the intake really fast, kinda like when you put ur hand on the hose of the vacuum and it makes that hissing sound. I friggin love it. But it is very noticeable windows up or down, just depends what you're looking for.

 

[DaleNixon]

I so want to hear the suck suck whoosh whoosh psssht psssht Cobb hurry the **** up and ship my s***!