PPE/Sikky headers on stock exhaust?
#31
Pole Position
Lou,
Do you know what is the cell count on the secondary cats?? They can't be as restrictive as the primaries are??
Anyhow I've had it with the drone with the Borla with the addition of the headers! I think I might be going back to the stock exhaust for my sanity
Just trying to figure out how much power I will lose going back to the stock exhaust? I'm assuming the majority of the gains with the exhaust system are losing/getting rid of the stock manifolds with the primary cats account for maybe 90% of the power gained?
So once again I would be FBO minus the stock exhaust (secondary cats/mufflers)..............
What do you guys think??? I really don't want to give up any power but the drone is beyond annoying and maybe I'm just getting older lol
Do you know what is the cell count on the secondary cats?? They can't be as restrictive as the primaries are??
Anyhow I've had it with the drone with the Borla with the addition of the headers! I think I might be going back to the stock exhaust for my sanity
Just trying to figure out how much power I will lose going back to the stock exhaust? I'm assuming the majority of the gains with the exhaust system are losing/getting rid of the stock manifolds with the primary cats account for maybe 90% of the power gained?
So once again I would be FBO minus the stock exhaust (secondary cats/mufflers)..............
What do you guys think??? I really don't want to give up any power but the drone is beyond annoying and maybe I'm just getting older lol
#32
Pole Position
Posted by Cayman: "If you install cats the exhaust tone will go down a bit. I'm actually surprised you find the header/Borla setup too much for you. It's the quietest setup i've come across with very tolerable "drone" levels.
EDIT: Forgot I had laid some sound deading material down awhile back. That could be why I'm good with the sound. I added this because the SIKKY/JOEZ combo was TOO much for me. I added this material and it was more tolerable and then with the change to Borla it was perfect.
https://www.clublexus.com/forums/is-f...ing-trunk.html "
Yea I was trying to save myself the $700 for two GESI cats.......and then that might not have solved the drone issue for me and then the cats would've already been welded onto the Borla?
What you said makes sense though the sound deading material probably is the difference I bet? Just like the Sikky/Joe-Z combo was too much for you, that's where I'm at with the PPE/Borla
Just trying to figure out how much I might lose going back to the stock exhaust but with PPE headers/Tune/Tuned intake/.......I'm guessing I shouldn't lose that much hopefully??
EDIT: Forgot I had laid some sound deading material down awhile back. That could be why I'm good with the sound. I added this because the SIKKY/JOEZ combo was TOO much for me. I added this material and it was more tolerable and then with the change to Borla it was perfect.
https://www.clublexus.com/forums/is-f...ing-trunk.html "
Yea I was trying to save myself the $700 for two GESI cats.......and then that might not have solved the drone issue for me and then the cats would've already been welded onto the Borla?
What you said makes sense though the sound deading material probably is the difference I bet? Just like the Sikky/Joe-Z combo was too much for you, that's where I'm at with the PPE/Borla
Just trying to figure out how much I might lose going back to the stock exhaust but with PPE headers/Tune/Tuned intake/.......I'm guessing I shouldn't lose that much hopefully??
#34
Pit Crew
iTrader: (1)
Lou,
Do you know what is the cell count on the secondary cats?? They can't be as restrictive as the primaries are??
Anyhow I've had it with the drone with the Borla with the addition of the headers! I think I might be going back to the stock exhaust for my sanity
Just trying to figure out how much power I will lose going back to the stock exhaust? I'm assuming the majority of the gains with the exhaust system are losing/getting rid of the stock manifolds with the primary cats account for maybe 90% of the power gained?
So once again I would be FBO minus the stock exhaust (secondary cats/mufflers)..............
What do you guys think??? I really don't want to give up any power but the drone is beyond annoying and maybe I'm just getting older lol
Do you know what is the cell count on the secondary cats?? They can't be as restrictive as the primaries are??
Anyhow I've had it with the drone with the Borla with the addition of the headers! I think I might be going back to the stock exhaust for my sanity
Just trying to figure out how much power I will lose going back to the stock exhaust? I'm assuming the majority of the gains with the exhaust system are losing/getting rid of the stock manifolds with the primary cats account for maybe 90% of the power gained?
So once again I would be FBO minus the stock exhaust (secondary cats/mufflers)..............
What do you guys think??? I really don't want to give up any power but the drone is beyond annoying and maybe I'm just getting older lol
#35
11 Second Club
iTrader: (2)
Hey Gabe, hope you're well sir! I can't share any experience on the ISF, obviously, however, I do remember going from a Full Race 3" to a 2.5" exhaust on my 2008 Civic Si when I was full bolt on and cammed, and my tuner said I basically lost no power at the elevation we're at. You figure we lose between 16-20% (depending on the air density that day) at our elevation; so if gains with an exhaust on an ISF are 15-20hp (per RR Racing's website), you're looking at potentially losing 12-16hp, if not even less. Personally, I'd be ok with that and in fact, I think I will run the PPE headers with the stock exhaust when I buy the car lol. Just not worth the noise for that little amount of power for me. Or, per Lou's comment, I would try running the Borla axle back and keep the stock mid-pipe with the secondary cats in place.
#37
Pole Position
Yea guys I've been going back and forth on this issue for a couple weeks now deciding between putting on side branch resonators to cancel out the drone, or welding on just the stock mufflers to cancel out the drone???
The thing is I don't want to lose any power, but want to get rid of the drone! We have another discussion going on in this thread here about the side branch resonators/j-pipe/Helmholtz chambers:
https://www.clublexus.com/forums/is-...-system-2.html
The thing is I don't want to lose any power, but want to get rid of the drone! We have another discussion going on in this thread here about the side branch resonators/j-pipe/Helmholtz chambers:
https://www.clublexus.com/forums/is-...-system-2.html
#38
Driver School Candidate
Bumping this thread for more feedback... Are people keeping the stock cats/midpipes with aftermarket headers, or is the only choice to go with high-flow cats on these headers+stock exhaust setups?
For others also interested, here are a handful of random Youtube videos I found for sound comparison (not my car):
Lexus ISF Sikky Headers + Stock Mid-pipe Muffler Delete
2008 Lexus ISF PPE Headers only- stock exhaust. (Audio only)
Sikky ISF header on stock lexus ISF
Lexus IS-F Sikky Headers Stock Exhaust Cats Delete and Reasonator
Lexus IS-F dynorun stock exhaust
For others also interested, here are a handful of random Youtube videos I found for sound comparison (not my car):
Lexus ISF Sikky Headers + Stock Mid-pipe Muffler Delete
2008 Lexus ISF PPE Headers only- stock exhaust. (Audio only)
Sikky ISF header on stock lexus ISF
Lexus IS-F Sikky Headers Stock Exhaust Cats Delete and Reasonator
Lexus IS-F dynorun stock exhaust
Last edited by John12ISF; 05-22-18 at 12:51 PM.
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