Considering 4in exhaust
#26
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I was considering 3.5" before as well but then when I couldn't find a good presilencer in 3.5" in oval form decided to go 4" which Borla has a nice big oval that fits just perfect (although tight). The 3.5" would have been a canister which would have stuck out under the car since it was 6.25" tall (if I remember correctly) which I did not want.
thewird
thewird
#27
I just saw this today while I was at the book store. 3.5" is the way to go and 4" is over kill! In the test, they gained 103 rwhp from 3" exhaust to 3.5". Same boost level and decreased spool time by 200 rpms. Great read with dyno results to back it up.
http://www.modified.com/tech/modp-11...ech/index.html
http://www.modified.com/tech/modp-11...ech/index.html
#29
35r 13b first gen
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http://www.streetsideauto.com/p/borl...GoogleShopping
I got mine as a blem for about 80 bucks because there was some plastic melted onto a small spot of it.... this is it tho... then magnaflow out back.
Elliot I am very happy with 3.5 in! thanks I'm sure I will be even when i put my dump tube back into the exhaust!
I got mine as a blem for about 80 bucks because there was some plastic melted onto a small spot of it.... this is it tho... then magnaflow out back.
Elliot I am very happy with 3.5 in! thanks I'm sure I will be even when i put my dump tube back into the exhaust!
#30
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Since I wanted the best sound suppression, I wanted their XR-1 multi-core and not the sportsman. Yes, there is a 3.5" oval in the sportsman variety but I chose to go 4" to get the multi-core.
part #400069 http://www.borla.com/products/produc...?cat=5&type=76
Also, if anyone is interested, Borla claims their XR-1 mufflers are built to withstand great sustained temps. "They can with stand constant temps of 2400 degrees with short burst of 2800 degrees.".
thewird
part #400069 http://www.borla.com/products/produc...?cat=5&type=76
Also, if anyone is interested, Borla claims their XR-1 mufflers are built to withstand great sustained temps. "They can with stand constant temps of 2400 degrees with short burst of 2800 degrees.".
thewird
#31
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Im going 4" on my car also. T04Z 1.06 rear housing.
currently 3.5" into twin 2.5" withon eresonator each side then back into single 3.5" wiht one big rear carn
now im going to 4" dump into existing rear, but then also doing a striaght through 4" section to replace the mid twin 2.5" section for track work, will have also converted all joins to v band.
wastgates feed back into current 3.5" dump, but going to change it so when current mid section is used, WG feed back into mid section, then when runnign 4", WG will vent to at.
currently 3.5" into twin 2.5" withon eresonator each side then back into single 3.5" wiht one big rear carn
now im going to 4" dump into existing rear, but then also doing a striaght through 4" section to replace the mid twin 2.5" section for track work, will have also converted all joins to v band.
wastgates feed back into current 3.5" dump, but going to change it so when current mid section is used, WG feed back into mid section, then when runnign 4", WG will vent to at.
#34
35r 13b first gen
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I didn't end up showing the judge the video... however I did get the ticket dropped since i have Hobbyist plates... The District attorney was a dick and upset when the judge said im throwing this out Haha
#36
Rotary Motoring
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that articles pretty cool, but a 3.5 would only make gains on cars with higher hp right?
If the car has a turbo there will be gains from the larger exhaust.
An issue with a smaller turbo (I assume what you mean by lower hp car) will be that the gains are so great you will not be able to control the boost creep with the wastegate(s) you have.
If the car has a turbo there will be gains from the larger exhaust.
An issue with a smaller turbo (I assume what you mean by lower hp car) will be that the gains are so great you will not be able to control the boost creep with the wastegate(s) you have.
#37
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While we are on the topic of larger exhaust for performance and possibility of increased decibels does wrapping the downpipe have an audible impact?
I know its for heat management but I was curious if anyone noticed a decrease in sound.
I know its for heat management but I was curious if anyone noticed a decrease in sound.
#45
Thanks for all the tips even though this is not my thread. I noticed I have a 4 in dp going to a welded cat which is welded to a 4 in cutoff and that continues to a welded 3.5 in y pipe which leads to a 3 in split exhaust with flowmaster tips. Should I make the y pipe and piping to the tips 3.5 in? Or keep them their respective sizes
#46
Thanks for all the tips even though this is not my thread. I noticed I have a 4 in dp going to a welded cat which is welded to a 4 in cutoff and that continues to a welded 3.5 in y pipe which leads to a 3 in exhaust with flowmaster tips. Is that a good setup for my 13b-t with full bolt ons and top mount
#47
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I run a full 4" exhaust that is actually relatively quiet. The trick was splitting it into dual 3" at the mufflers, which has more cross-sectional area than a single four, while also having a much higher muffled surface area. I built the mufflers and rolled the perf tube myself to ensure as much sound reduction as possible and the end result was better than expected!
#48
I run a full 4" exhaust that is actually relatively quiet. The trick was splitting it into dual 3" at the mufflers, which has more cross-sectional area than a single four, while also having a much higher muffled surface area. I built the mufflers and rolled the perf tube myself to ensure as much sound reduction as possible and the end result was better than expected!
#49
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I run a full 4" exhaust that is actually relatively quiet. The trick was splitting it into dual 3" at the mufflers, which has more cross-sectional area than a single four, while also having a much higher muffled surface area. I built the mufflers and rolled the perf tube myself to ensure as much sound reduction as possible and the end result was better than expected!
#50
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Some more food... This is at ~300 rwhp power levels and it had gains of 15 rwhp going to a 4" from a 3". Can't wait for spring when I get to test my new 4" exhaust
http://www.turbo944.com/bbs/config.c...ames;read=3942
thewird
http://www.turbo944.com/bbs/config.c...ames;read=3942
thewird