# Catalytic converter replaced with turbo **URL:** \ **Category:** General Discussion\ **Created:** [July 23, 2025, 3:23pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126 "2025-07-23T15:23:36Z")\ **Posts on this page:** 11\ **Page:** 2
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [July 25, 2025, 7:25pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/21 "2025-07-25T19:25:08Z")
> [@TwinTurbo](#): > > Probably not really doing its job located there. Take forever to get up to temp if it ever does unless the engine is running super rich and even then…exhaust gas has cooled quite a bit by the time it gets to the muffler in a pickup. It was located there by design. Chevy 3/4 and 1 tons with the 454 had the catalyst behind the muffler for a few years. The late 80’s-early 90’s engine ran dirty enough that under load the catalysts would overheat and melt down. They needed to be further back from the engine to stay alive. Now cars have the catalyst integrated into the manifold… > [@Buckedzulu](#): > > What does reducing emissions do for the engine When I change the oil in my engine, the engine doesn’t care where the old oil goes. I can dispose of it at an oil recycler or I can dump it in the storm drain in the street in front of my house. The engine doesn’t care. When the exhaust leaves the engine, the engine doesn’t care where it goes. It can go through a catalyst or it can go out into the air I breathe. The engine doesn’t care. However, both of these are stupid things to do. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [July 25, 2025, 7:30pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/22 "2025-07-25T19:30:09Z")
@Buckedzulu If you are in the USA altering the emmisions equipment will get you a large fine . Also effect the air that people breath which is why you should not do that. If you really want a Turbo just buy a vehicle that already has it installed by the factory. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [July 25, 2025, 7:50pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/23 "2025-07-25T19:50:02Z")
> [@Buckedzulu](#): > > I was thinking of cars that don’t have room in the front for a turbo This will guarantee you LOTS of ‘turbo lag’, the time between hitting the gas and getting a response from the engine. Bad idea for street use. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 25, 2025, 7:56pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/24 "2025-07-25T19:56:31Z")
Interesting that quest for better mpg resulted in smaller displacement motors that use turbos and folks realized that replacing wimpy turbos with big turbos makes more power. No one used them in big cubes days. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [July 25, 2025, 8:00pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/25 "2025-07-25T20:00:44Z")
> [@Cavell](#): > > No one used them in big cubes days. The 90s-vintage Bentley Turbo-R used a 6.75 liter (412 c.i.) V8 equipped with a turbocharger. ---
**Author:** ![TwinTurbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@TwinTurbo](https://community.cartalk.com/u/TwinTurbo)\ **Post date:** [July 25, 2025, 8:40pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/26 "2025-07-25T20:40:24Z")
> [@Cavell](#): > > No one used them in big cubes days Superchargers ruled back then ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [July 25, 2025, 9:24pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/27 "2025-07-25T21:24:25Z")
It seems to me that the farther away from the intake manifold the turbo is, the greater the pressure loss. Distance and additional tube bends would reduce efficiency. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 25, 2025, 10:01pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/28 "2025-07-25T22:01:42Z")
With turbo chargers 10 feet from the engine, it would take a moment to fill those long pipes with air pressure, I wonder if that was understood before the project began. This is a nice direct path to the intake manifold, the first few years did not have an intercooler. ![image](https://global.discourse-cdn.com/cartalk/original/3X/6/9/693702e09be3096fc3ddb7b24c1ab30ad8185cdf.jpeg) ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [July 26, 2025, 12:57am UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/29 "2025-07-26T00:57:54Z")
> [@Buckedzulu](#): > > Other than the fact that there are laws and regulations about it. What does reducing emissions do for the engine Short answer, nothing… An engine makes power by moving air & fuel through it, the more air & fuel it can move the more power it can possibly make, so for a given cubic inch engine, the better the induction side and better flowing/less restrictive exhaust side, the more power the engine is capable of making, to a point, **everything** has to work together… But everything has a seesaw effect, removing the Cat, resonator, muffler, and or whatever, the more emissions it is producing, or more correct the less emissions it is controlling… ---
**Author:** ![TwinTurbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@TwinTurbo](https://community.cartalk.com/u/TwinTurbo)\ **Post date:** [July 26, 2025, 1:54pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/30 "2025-07-26T13:54:23Z")
> [@davesmopar](#): > > less restrictive exhaust side, the more power the engine is capable of making You just have to be careful. Too little backpressure is also no good, it causes too much exhaust scavenging and results in less volumetric efficiency. Pulse charging is important aspect of engine design… ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [July 26, 2025, 4:39pm UTC](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126/31 "2025-07-26T16:39:10Z")
I like cats. [Previous page](https://community.cartalk.com/t/catalytic-converter-replaced-with-turbo/201126.md?page=1)