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Discussion Starter · #1 ·
Hey guys a little bit of a story here, but I am trying to see if anyone else had a similar problem.

I started out with stock dp with resonator and muffler delete, using a stratified 93 flash tune. the car felt great had an awesome torque punch and all.

Then everything changed when the fire nation attacked. lols sorry, but really I ended up getting an MBRP catless turboback, so a full system. I ended up once again going with a stratified flash tune to update with my new components. Now I am not trying to flame Stratified, they provide great services.

After this new setup however I felt my car was lacking in the power department. Now I don't mean it wasn't hitting boost it was still powerful, but it just didn't feel like that punch it had was there anymore.

I ended up contacting stratified on this and they reviewed my data-log only to find nothing wrong with it. I was stumped and craving more power, So I decided to try another tuner for comparison. I ended up with an ethanol blend tune from Deadhook Motorsports after reading the crazy dyno numbers, We aren't done with the process yet as I am on my 3rd revision, not sure how many more we go through but still even with the e30 it doesn't feel as powerful as it was when I had my stock dp and exhaust.

So in the end I guess I am wondering if anyone has had similar problems when going catless, and again this is not ment to be a tune flame. I appreciate all stratified and dhm have done for me so far.
Thank you for the input!
 

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Probably doesn't feel as fast because it is louder now. I've been through that with multiple cars. The last car when I went catless it felt slower but made 13 more hp on the dyno.
 

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Probably doesn't feel as fast because it is louder now. I've been through that with multiple cars. The last car when I went catless it felt slower but made 13 more hp on the dyno.
I agree with this. When I went to a full turbo back it felt slower, only because there was much more noise involved. What you hear is playing tricks on your mind because your expecting it to be much faster due to the loudness when in reality it's only slightly faster


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Discussion Starter · #5 ·
Probably doesn't feel as fast because it is louder now. I've been through that with multiple cars. The last car when I went catless it felt slower but made 13 more hp on the dyno.
I agree with this. When I went to a full turbo back it felt slower, only because there was much more noise involved. What you hear is playing tricks on your mind because your expecting it to be much faster due to the loudness when in reality it's only slightly faster


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While I understand what you mean, I don't think that's the case here as the car is actually much quieter with this setup. It was really loud with the muffler and resonator delete.
 

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My first reaction was "boost leak", but Alex from stratified was able to detect a small leak in a vacuum line robbing me of about 1.5psi of peak boost and slower boost response. If he didn't find any anomalies, I'm not sure, that's just weird. I've owned multiple V8 cars and never did upgrading the exhaust make me feel like it was slower because it was louder.

I will say this though: I had a 1990 Iroc Z. Super clapped out. The flow master dual exhaust was leaking pretty bad. It was rusty and the gaskets were blown out. I repaired a section of pipe and replaced the gaskets, and I was shocked as to how much seat of the pants performance improved.

Are you sure everything is bolted up snug and you're not leaking super badly? At face value it would seem that leaks like this would reduce exhaust pressure, thereby making it slower to flow? Just a conjecture after my experiences, this isn't grounded in science whatsoever.
 

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Discussion Starter · #7 ·
My first reaction was "boost leak", but Alex from stratified was able to detect a small leak in a vacuum line robbing me of about 1.5psi of peak boost and slower boost response. If he didn't find any anomalies, I'm not sure, that's just weird. I've owned multiple V8 cars and never did upgrading the exhaust make me feel like it was slower because it was louder.

I will say this though: I had a 1990 Iroc Z. Super clapped out. The flow master dual exhaust was leaking pretty bad. It was rusty and the gaskets were blown out. I repaired a section of pipe and replaced the gaskets, and I was shocked as to how much seat of the pants performance improved.

Are you sure everything is bolted up snug and you're not leaking super badly? At face value it would seem that leaks like this would reduce exhaust pressure, thereby making it slower to flow? Just a conjecture after my experiences, this isn't grounded in science whatsoever.
That's defiantly something I will look into, I've been meaning to go readjust the exhaust because it's rattling. I will make sure everything is tight. Thanks
 

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If you're expecting more power from a catless DP with stock turbo you are expecting way too much.
 

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That's weird. I understand what the other guys are saying about your expectations bc of the loudness, but switching to a high flow dp should give you better throttle response and quicker spool times before you even get the rpms up enough to notice any hp increase. I have a cbe and this is one thing I've been really conflicted over bc i'm only a dp away from being stage 3. If you had an exhaust leak bad enough to notice a power loss you should be able to hear where it is standing next to your car running at idle, and you said it is quieter so I doubt that is the case too. I really don't know, you can't even blame the tune since you used stratified and DHM. This is the first time you've had an E-tune? I'm stumped man.
 
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