# WTF does my car have VTEC? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [March 3, 2009, 9:45am UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257 "2009-03-03T09:45:31Z")\ **Posts on this page:** 10\ **Page:** 3
**Author:** ![DA\_1](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@DA\_1](https://forums.speedlife.net/u/DA_1)\ **Post date:** [March 5, 2009, 7:32pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/41 "2009-03-05T19:32:29Z")
[QUOTE=XSNRGE;383859]Thanks for the response guys! I’ll be PM’ing you in the future when I have some more questions regarding my build! R33, I believe a 3" exhaust does lose power… I’ve got a 3" Bee\*R on my SOHC KA. Only mods other than that are intake pipe and HKS filter. The moment I removed the silencer from my exhaust, I really noticed a loss of low-end torque. The mid-range climb to top-end improved by quite a bit, but it wasn’t too much of a drastic improvement to justify baiting your car with a loud exhaust with only minimalistic gains. If I could do it all over again, I’d be running a 2.5" high-flow cat and cat-back… As for 2.5" cat-backs, no clue on what to run with, though… very well said thats exactly the result u loose lowend torque but gain minimal up top…2.5 inch exhaust have proven to be fine up to 400+ whp ---
**Author:** ![DA\_1](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@DA\_1](https://forums.speedlife.net/u/DA_1)\ **Post date:** [March 5, 2009, 7:34pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/42 "2009-03-05T19:34:58Z")
> [@Dec. 2nd 10pm - Redman, Raekwon, Ghostface, DJ Kool, Smif N Wesson and more](https://forums.speedlife.net/t/dec-2nd-10pm-redman-raekwon-ghostface-dj-kool-smif-n-wesson-and-more/20606/3): > > Thanks for the response guys! I’ll be PM’ing you in the future when I have some more questions regarding my build! > > R33, I believe a 3" exhaust does lose power… I’ve got a 3" Bee\*R on my SOHC KA. Only mods other than that are intake pipe and HKS filter. The moment I removed the silencer from my exhaust, I really noticed a loss of low-end torque. The mid-range climb to top-end improved by quite a bit, but it wasn’t too much of a drastic improvement to justify baiting your car with a loud exhaust with only minimalistic gains. > > If I could do it all over again, I’d be running a 2.5" high-flow cat and cat-back… As for 2.5" cat-backs, no clue on what to run with, though… > > Whats the stock KA downpipe-to-cat diameter? very well said thats exactly the result u loose lowend torque but gain minimal up top…2.5 inch exhaust have proven to be fine up to 400+ whp ---
**Author:** ![91S131](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91s131/32/5732_2.png) [@91S131](https://forums.speedlife.net/u/91S131)\ **Post date:** [March 6, 2009, 1:44pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/43 "2009-03-06T13:44:12Z")
> very well said thats exactly the result u loose lowend torque but gain minimal up top…2.5 inch exhaust have proven to be fine up to 400+ whp ^^^ are you sure ?, is there anyone here running 2.5" exhaust with 400+ horses ? ---
**Author:** ![draggone](https://avatars.discourse-cdn.com/v4/letter/d/5fc32e/32.png) [@draggone](https://forums.speedlife.net/u/draggone)\ **Post date:** [March 6, 2009, 5:33pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/44 "2009-03-06T17:33:12Z")
> [@pulley without dampener](https://forums.speedlife.net/t/pulley-without-dampener/20537/10): > > ^^^ are you sure ?, is there anyone here running 2.5" exhaust with 400+ horses ? People always think bigger is better,they always forget about functionality,do you possibly think any 4banger boosted producing 400whp flow`s more exhaust gases that a v8/v10 producing 500whp or even 400whp,they run 2.5 99% of the time. think about this and answer ur question for urself… ---
**Author:** ![sidewayz240](https://avatars.discourse-cdn.com/v4/letter/s/e99b99/32.png) [@sidewayz240](https://forums.speedlife.net/u/sidewayz240)\ **Post date:** [March 6, 2009, 7:23pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/45 "2009-03-06T19:23:19Z")
Those V8/V10’s are N/A. 98% of 400hp motors on here are going to be turbo. Turbo no like restirction, turbo like flow. ---
**Author:** ![RED\_LINE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/red_line/32/5656_2.png) [@RED\_LINE](https://forums.speedlife.net/u/RED_LINE)\ **Post date:** [March 6, 2009, 7:36pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/46 "2009-03-06T19:36:22Z")
with Turbo’s…3" or bigger exhaust is the way to go. 2.5" will be restrictive in no time once your looking for more spoolin, pretty much will be a bottle neck. ---
**Author:** ![DA\_1](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@DA\_1](https://forums.speedlife.net/u/DA_1)\ **Post date:** [March 6, 2009, 8:50pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/47 "2009-03-06T20:50:52Z")
> [@Which Verizon phone to get???](https://forums.speedlife.net/t/which-verizon-phone-to-get/20655/2): > > Those V8/V10’s are N/A. 98% of 400hp motors on here are going to be turbo. Turbo no like restirction, turbo like flow. Please tell me how many 400whp sr20`s or ka-t`s you know exist here on SON lol 1,2,3!!!while those v8/v10`s are N/A they still flow more than any 4banger @400whp. you are right turbo`s do like flow and a smaller exhaust would be more of a restriction at high rpms, BUT its still not necessary for a street machine even @400whp… alot of guys have run 11`s even 10`s on 2.5 inch exhaust without any issues.(always remember the practicality factor when building a street car) now if ur talking a full race/track car then its a different ballgame.go big 3inch 4inch whatever or take it off completely ur the man more power to you literally… ---
**Author:** ![jed240](https://avatars.discourse-cdn.com/v4/letter/j/a4c791/32.png) [@jed240](https://forums.speedlife.net/u/jed240)\ **Post date:** [May 9, 2009, 12:11am UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/48 "2009-05-09T00:11:15Z")
KA love. Dan’s dyno shows that a n/a ka24de can make almost as much whp as a stock sr20det and for a lot less. was your car a auto-5spd swap? I think the auto ecu on a standard car leans it out and does give it some power. Dont have anything to base it on, but I used to have a auto ecu and recently swapped to a standard ecu in my 216k+ oily KA… with the auto ecu my KA was seeing quite a lot of 7.5k rpm(no rev limit), backfires and a lot of abuse hence the switch to 5spd ecu, which sounds mellow in comparison and a little less power. hopefully if my car is on the road soon with itb and 248/248 cams i’ll get it to the dyno and see how much power it makes. ---
**Author:** ![SRI\_Motorsports](https://avatars.discourse-cdn.com/v4/letter/s/e5b9ba/32.png) [@SRI\_Motorsports](https://forums.speedlife.net/u/SRI_Motorsports)\ **Post date:** [May 9, 2009, 8:35pm UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/49 "2009-05-09T20:35:40Z")
Elon…We need to get together and talk over my Ka bro. Need some input on a few things. Call my cell (905) 716-7749. ---
**Author:** ![R33](https://avatars.discourse-cdn.com/v4/letter/r/5f8ce5/32.png) [@R33](https://forums.speedlife.net/u/R33)\ **Post date:** [May 10, 2009, 12:57am UTC](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257/50 "2009-05-10T00:57:12Z")
> [@feeler: how much would someone pay if i came across a wii](https://forums.speedlife.net/t/feeler-how-much-would-someone-pay-if-i-came-across-a-wii/21893/15): > > KA love. Dan’s dyno shows that a n/a ka24de can make almost as much whp as a stock sr20det and for a lot less. was your car a auto-5spd swap? I think the auto ecu on a standard car leans it out and does give it some power. Dont have anything to base it on, but I used to have a auto ecu and recently swapped to a standard ecu in my 216k+ oily KA… with the auto ecu my KA was seeing quite a lot of 7.5k rpm(no rev limit), backfires and a lot of abuse hence the switch to 5spd ecu, which sounds mellow in comparison and a little less power. hopefully if my car is on the road soon with itb and 248/248 cams i’ll get it to the dyno and see how much power it makes. im pretty sure i was using a 5 speed ECU … the 4th gear stopped when the car hit redline at 6800k [Previous page](https://forums.speedlife.net/t/wtf-does-my-car-have-vtec/122257.md?page=2)